Federal Register Recent Federal Regulation Documents - Justia Regulation Tracker - Justia Regulations Tracker https://regulations.justia.com/regulations/fedreg/agencies/department-of-homeland-security/transportation-security-administration/2021?limit=200&registers=between&min-day=1&min-month=1&max-day=31&max-month=12&mode=atom 2024-02-23T23:40:00-08:00 Justia Inc https://www.justia.com/ Justia Regulations Tracker https://regulations.justia.com/images/justiafedregulations.gif Copyright 2011 Justia Inc https://regulations.justia.com/regulations/fedreg/2021/12/27/2021-28041.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Security Threat Assessment for Individuals Applying for a Hazardous Materials Endorsement for a Commercial Driver's License 2021-12-27T00:00:00-08:00 2021-12-27T00:00:00-08:00 2021-28041 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-27/pdf/2021-28041.pdf https://regulations.justia.com/regulations/fedreg/2021/12/23/2021-27886.html Notice - Intent To Request an Extension From OMB of One Current Public Collection of Information: Cybersecurity Measures for Surface Modes 2021-12-23T00:00:00-08:00 2021-12-23T00:00:00-08:00 2021-27886 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-23/pdf/2021-27886.pdf https://regulations.justia.com/regulations/fedreg/2021/12/23/2021-27876.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Rail Transportation Security 2021-12-23T00:00:00-08:00 2021-12-23T00:00:00-08:00 2021-27876 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-23/pdf/2021-27876.pdf https://regulations.justia.com/regulations/fedreg/2021/12/21/2021-27597.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Aviation Security Customer Satisfaction Performance Measurement Passenger Survey 2021-12-21T00:00:00-08:00 2021-12-21T00:00:00-08:00 2021-27597 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-21/pdf/2021-27597.pdf https://regulations.justia.com/regulations/fedreg/2021/12/21/2021-27592.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Maryland Three Airports: Enhanced Security Procedures for Operations at Certain Airports in the Washington, DC, Metropolitan Area Flight Restricted Zone 2021-12-21T00:00:00-08:00 2021-12-21T00:00:00-08:00 2021-27592 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-21/pdf/2021-27592.pdf https://regulations.justia.com/regulations/fedreg/2021/12/20/2021-27477.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Aircraft Repair Station Security 2021-12-20T00:00:00-08:00 2021-12-20T00:00:00-08:00 2021-27477 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-20/pdf/2021-27477.pdf https://regulations.justia.com/regulations/fedreg/2021/12/08/2021-26534.html Notice - Enforcement Actions Summary 2021-12-08T00:00:00-08:00 2021-12-08T00:00:00-08:00 2021-26534 Notice https://www.govinfo.gov/content/pkg/FR-2021-12-08/pdf/2021-26534.pdf https://regulations.justia.com/regulations/fedreg/2021/11/22/2021-25423.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Federal Flight Deck Officer Program 2021-11-22T00:00:00-08:00 2021-11-22T00:00:00-08:00 2021-25423 Notice https://www.govinfo.gov/content/pkg/FR-2021-11-22/pdf/2021-25423.pdf https://regulations.justia.com/regulations/fedreg/2021/11/15/2021-24885.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: TSA End of Course Level 1 Evaluation-Instructor-Led Classroom Training 2021-11-15T00:00:00-08:00 2021-11-15T00:00:00-08:00 2021-24885 Notice https://www.govinfo.gov/content/pkg/FR-2021-11-15/pdf/2021-24885.pdf https://regulations.justia.com/regulations/fedreg/2021/11/15/2021-24862.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Pipeline Corporate Security Review 2021-11-15T00:00:00-08:00 2021-11-15T00:00:00-08:00 2021-24862 Notice https://www.govinfo.gov/content/pkg/FR-2021-11-15/pdf/2021-24862.pdf https://regulations.justia.com/regulations/fedreg/2021/11/12/2021-24643.html Notice - Aviation Security Advisory Committee (ASAC) Public Meeting 2021-11-12T00:00:00-08:00 2021-11-12T00:00:00-08:00 2021-24643 Notice https://www.govinfo.gov/content/pkg/FR-2021-11-12/pdf/2021-24643.pdf https://regulations.justia.com/regulations/fedreg/2021/11/10/2021-24526.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: TSA Claims Application 2021-11-10T00:00:00-08:00 2021-11-10T00:00:00-08:00 2021-24526 Notice https://www.govinfo.gov/content/pkg/FR-2021-11-10/pdf/2021-24526.pdf https://regulations.justia.com/regulations/fedreg/2021/11/01/2021-23668.html Notice - Surface Transportation Security Advisory Committee (STSAC) Meeting 2021-11-01T00:00:00-07:00 2021-11-01T00:00:00-07:00 2021-23668 Notice https://www.govinfo.gov/content/pkg/FR-2021-11-01/pdf/2021-23668.pdf https://regulations.justia.com/regulations/fedreg/2021/10/18/2021-22564.html Rule - Civil Monetary Penalty Adjustments for Inflation 2021-10-18T00:00:00-07:00 2021-10-18T00:00:00-07:00 2021-22564 Rule https://www.govinfo.gov/content/pkg/FR-2021-10-18/pdf/2021-22564.pdf https://regulations.justia.com/regulations/fedreg/2021/10/14/2021-22332.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Pipeline Operator Security Information 2021-10-14T00:00:00-07:00 2021-10-14T00:00:00-07:00 2021-22332 Notice https://www.govinfo.gov/content/pkg/FR-2021-10-14/pdf/2021-22332.pdf https://regulations.justia.com/regulations/fedreg/2021/10/14/2021-22329.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Critical Facility Information of the Top 100 Most Critical Pipelines 2021-10-14T00:00:00-07:00 2021-10-14T00:00:00-07:00 2021-22329 Notice https://www.govinfo.gov/content/pkg/FR-2021-10-14/pdf/2021-22329.pdf https://regulations.justia.com/regulations/fedreg/2021/09/30/2021-21284.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Security Programs for Foreign Air Carriers 2021-09-30T00:00:00-07:00 2021-09-30T00:00:00-07:00 2021-21284 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-30/pdf/2021-21284.pdf https://regulations.justia.com/regulations/fedreg/2021/09/30/2021-21220.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Crew Member Self-Defense Training-Registration and Evaluation 2021-09-30T00:00:00-07:00 2021-09-30T00:00:00-07:00 2021-21220 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-30/pdf/2021-21220.pdf https://regulations.justia.com/regulations/fedreg/2021/09/30/2021-21218.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Law Enforcement (LEO) Reimbursement Request 2021-09-30T00:00:00-07:00 2021-09-30T00:00:00-07:00 2021-21218 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-30/pdf/2021-21218.pdf https://regulations.justia.com/regulations/fedreg/2021/09/29/2021-21190.html Notice - Temporary Exemption of Certain Aircraft Operator Security Standards 2021-09-29T00:00:00-07:00 2021-09-29T00:00:00-07:00 2021-21190 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-29/pdf/2021-21190.pdf https://regulations.justia.com/regulations/fedreg/2021/09/29/2021-21147.html Notice - TSA PreCheck® Application Program Fees 2021-09-29T00:00:00-07:00 2021-09-29T00:00:00-07:00 2021-21147 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-29/pdf/2021-21147.pdf https://regulations.justia.com/regulations/fedreg/2021/09/29/2021-21143.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Maryland Three Airports: Enhanced Security Procedures for Operations at Certain Airports in the Washington, DC, Metropolitan Area Flight Restricted Zone 2021-09-29T00:00:00-07:00 2021-09-29T00:00:00-07:00 2021-21143 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-29/pdf/2021-21143.pdf https://regulations.justia.com/regulations/fedreg/2021/09/29/2021-21142.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Generic Clearance for the Collection of Qualitative Feedback on Agency Service Delivery 2021-09-29T00:00:00-07:00 2021-09-29T00:00:00-07:00 2021-21142 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-29/pdf/2021-21142.pdf https://regulations.justia.com/regulations/fedreg/2021/09/29/2021-21096.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Department of Homeland Security Traveler Redress Inquiry Program (DHS TRIP) 2021-09-29T00:00:00-07:00 2021-09-29T00:00:00-07:00 2021-21096 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-29/pdf/2021-21096.pdf https://regulations.justia.com/regulations/fedreg/2021/09/20/2021-20293.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: TSA Airspace Waiver Program 2021-09-20T00:00:00-07:00 2021-09-20T00:00:00-07:00 2021-20293 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-20/pdf/2021-20293.pdf https://regulations.justia.com/regulations/fedreg/2021/09/03/2021-19021.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Exercise Information System 2021-09-03T00:00:00-07:00 2021-09-03T00:00:00-07:00 2021-19021 Notice https://www.govinfo.gov/content/pkg/FR-2021-09-03/pdf/2021-19021.pdf https://regulations.justia.com/regulations/fedreg/2021/08/27/2021-18533.html Notice - Intent To Request an Extension From OMB of One Current Public Collection of Information: Pipeline Corporate Security Review Program 2021-08-27T00:00:00-07:00 2021-08-27T00:00:00-07:00 2021-18533 Notice https://www.govinfo.gov/content/pkg/FR-2021-08-27/pdf/2021-18533.pdf https://regulations.justia.com/regulations/fedreg/2021/08/26/2021-18362.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Military Severely Injured Joint Support Operations Center (MSIJSOC) and Travel Protocol Office (TPO) Programs 2021-08-26T00:00:00-07:00 2021-08-26T00:00:00-07:00 2021-18362 Notice https://www.govinfo.gov/content/pkg/FR-2021-08-26/pdf/2021-18362.pdf https://regulations.justia.com/regulations/fedreg/2021/08/26/2021-18358.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Baseline Assessment for Security Enhancement (BASE) Program 2021-08-26T00:00:00-07:00 2021-08-26T00:00:00-07:00 2021-18358 Notice https://www.govinfo.gov/content/pkg/FR-2021-08-26/pdf/2021-18358.pdf https://regulations.justia.com/regulations/fedreg/2021/08/25/2021-18225.html Notice - Intent To Request Revision From OMB of One Current Public Collection of Information: Flight Training Security 2021-08-25T00:00:00-07:00 2021-08-25T00:00:00-07:00 2021-18225 Notice https://www.govinfo.gov/content/pkg/FR-2021-08-25/pdf/2021-18225.pdf https://regulations.justia.com/regulations/fedreg/2021/08/23/2021-17947.html Notice - Intent To Request Revision From OMB of One Current Public Collection of Information: Aviation Security Customer Satisfaction Performance Measurement Passenger Survey 2021-08-23T00:00:00-07:00 2021-08-23T00:00:00-07:00 2021-17947 Notice https://www.govinfo.gov/content/pkg/FR-2021-08-23/pdf/2021-17947.pdf https://regulations.justia.com/regulations/fedreg/2021/08/10/2021-17007.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Law Enforcement Officer Flying Armed Training 2021-08-10T00:00:00-07:00 2021-08-10T00:00:00-07:00 2021-17007 Notice https://www.govinfo.gov/content/pkg/FR-2021-08-10/pdf/2021-17007.pdf https://regulations.justia.com/regulations/fedreg/2021/07/30/2021-16216.html Notice - New Agency Information Collection Activity Under OMB Review: Speaker Request Form. 2021-07-30T00:00:00-07:00 2021-07-30T00:00:00-07:00 2021-16216 Notice https://www.govinfo.gov/content/pkg/FR-2021-07-30/pdf/2021-16216.pdf https://regulations.justia.com/regulations/fedreg/2021/07/26/2021-15902.html Notice - Exemption for Exclusive Area Agreements at Certain Airports 2021-07-26T00:00:00-07:00 2021-07-26T00:00:00-07:00 2021-15902 Notice https://www.govinfo.gov/content/pkg/FR-2021-07-26/pdf/2021-15902.pdf https://regulations.justia.com/regulations/fedreg/2021/07/14/2021-14898.html Notice - Extension of Agency Information Collection Activity Under OMB Review; Airport Security 2021-07-14T00:00:00-07:00 2021-07-14T00:00:00-07:00 2021-14898 Notice https://www.govinfo.gov/content/pkg/FR-2021-07-14/pdf/2021-14898.pdf https://regulations.justia.com/regulations/fedreg/2021/07/13/2021-14886.html Notice - Revision of Agency Information Collection Activity Under OMB Review: TSA Customer Comment Tools 2021-07-13T00:00:00-07:00 2021-07-13T00:00:00-07:00 2021-14886 Notice https://www.govinfo.gov/content/pkg/FR-2021-07-13/pdf/2021-14886.pdf https://regulations.justia.com/regulations/fedreg/2021/07/09/2021-14518.html Notice - TSA PreCheck® Application Program Fees 2021-07-09T00:00:00-07:00 2021-07-09T00:00:00-07:00 2021-14518 Notice https://www.govinfo.gov/content/pkg/FR-2021-07-09/pdf/2021-14518.pdf https://regulations.justia.com/regulations/fedreg/2021/07/08/2021-14517.html Notice - Request for Applicants for Appointment to the Surface Transportation Security Advisory Committee 2021-07-08T00:00:00-07:00 2021-07-08T00:00:00-07:00 2021-14517 Notice https://www.govinfo.gov/content/pkg/FR-2021-07-08/pdf/2021-14517.pdf https://regulations.justia.com/regulations/fedreg/2021/06/30/2021-13885.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Pipeline Operator Security Information 2021-06-30T00:00:00-07:00 2021-06-30T00:00:00-07:00 2021-13885 Notice https://www.govinfo.gov/content/pkg/FR-2021-06-30/pdf/2021-13885.pdf https://regulations.justia.com/regulations/fedreg/2021/06/30/2021-13884.html Notice - Intent To Request Revision From OMB of One Current Public Collection of Information: Critical Facility Information of the Top 100 Most Critical Pipelines 2021-06-30T00:00:00-07:00 2021-06-30T00:00:00-07:00 2021-13884 Notice https://www.govinfo.gov/content/pkg/FR-2021-06-30/pdf/2021-13884.pdf https://regulations.justia.com/regulations/fedreg/2021/06/14/2021-12372.html Notice - Announcing Opportunity To Become a Secured Packing Facility 2021-06-14T00:00:00-07:00 2021-06-14T00:00:00-07:00 2021-12372 Notice https://www.govinfo.gov/content/pkg/FR-2021-06-14/pdf/2021-12372.pdf https://regulations.justia.com/regulations/fedreg/2021/06/04/2021-11770.html Notice - Intent To Request a Revision From OMB of One Current Public Collection of Information: Department of Homeland Security Traveler Redress Inquiry Program (DHS TRIP) 2021-06-04T00:00:00-07:00 2021-06-04T00:00:00-07:00 2021-11770 Notice https://www.govinfo.gov/content/pkg/FR-2021-06-04/pdf/2021-11770.pdf https://regulations.justia.com/regulations/fedreg/2021/06/04/2021-11751.html Notice - Intent To Request Revision of Agency Information Collection Activity Under OMB Review: Baseline Assessment for Security Enhancement (BASE) Program 2021-06-04T00:00:00-07:00 2021-06-04T00:00:00-07:00 2021-11751 Notice https://www.govinfo.gov/content/pkg/FR-2021-06-04/pdf/2021-11751.pdf https://regulations.justia.com/regulations/fedreg/2021/05/14/2021-10185.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Security Programs for Foreign Air Carriers 2021-05-14T00:00:00-07:00 2021-05-14T00:00:00-07:00 2021-10185 Notice https://www.govinfo.gov/content/pkg/FR-2021-05-14/pdf/2021-10185.pdf https://regulations.justia.com/regulations/fedreg/2021/05/14/2021-10182.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Screening Partnership Program 2021-05-14T00:00:00-07:00 2021-05-14T00:00:00-07:00 2021-10182 Notice https://www.govinfo.gov/content/pkg/FR-2021-05-14/pdf/2021-10182.pdf https://regulations.justia.com/regulations/fedreg/2021/05/13/2021-10131.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Certified Cargo Screening Standard Security Program 2021-05-13T00:00:00-07:00 2021-05-13T00:00:00-07:00 2021-10131 Notice https://www.govinfo.gov/content/pkg/FR-2021-05-13/pdf/2021-10131.pdf https://regulations.justia.com/regulations/fedreg/2021/05/10/2021-09804.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Law Enforcement Officer (LEO) Reimbursement Request 2021-05-10T00:00:00-07:00 2021-05-10T00:00:00-07:00 2021-09804 Notice https://www.govinfo.gov/content/pkg/FR-2021-05-10/pdf/2021-09804.pdf https://regulations.justia.com/regulations/fedreg/2021/05/04/2021-09394.html Rule - Security Training for Surface Transportation Employees; Extension of Compliance Dates; Correcting Amendments 2021-05-04T00:00:00-07:00 2021-05-04T00:00:00-07:00 2021-09394 Rule https://www.govinfo.gov/content/pkg/FR-2021-05-04/pdf/2021-09394.pdf https://regulations.justia.com/regulations/fedreg/2021/05/03/2021-09234.html Notice - Intent To Request Extension From OMB of One Public Collection of Information: Exercise Information System 2021-05-03T00:00:00-07:00 2021-05-03T00:00:00-07:00 2021-09234 Notice https://www.govinfo.gov/content/pkg/FR-2021-05-03/pdf/2021-09234.pdf https://regulations.justia.com/regulations/fedreg/2021/05/03/2021-09227.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Flight Crew Self-Defense Training-Registration and Evaluation 2021-05-03T00:00:00-07:00 2021-05-03T00:00:00-07:00 2021-09227 Notice https://www.govinfo.gov/content/pkg/FR-2021-05-03/pdf/2021-09227.pdf https://regulations.justia.com/regulations/fedreg/2021/04/22/2021-08393.html Notice - Intent To Request Approval From OMB of One New Public Collection of Information: Speaker Request Form 2021-04-22T00:00:00-07:00 2021-04-22T00:00:00-07:00 2021-08393 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-22/pdf/2021-08393.pdf https://regulations.justia.com/regulations/fedreg/2021/04/13/2021-07482.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: TSA Customer Comment Card 2021-04-13T00:00:00-07:00 2021-04-13T00:00:00-07:00 2021-07482 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-13/pdf/2021-07482.pdf https://regulations.justia.com/regulations/fedreg/2021/04/12/2021-07362.html Notice - Request for Applicants for Appointment to the Aviation Security Advisory Committee 2021-04-12T00:00:00-07:00 2021-04-12T00:00:00-07:00 2021-07362 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-12/pdf/2021-07362.pdf https://regulations.justia.com/regulations/fedreg/2021/04/08/2021-07193.html Notice - Intent To Request Revision From OMB of One Current Public Collection of Information: Security Threat Assessment for Individuals Applying for a Hazardous Materials Endorsement for a Commercial Driver's License 2021-04-08T00:00:00-07:00 2021-04-08T00:00:00-07:00 2021-07193 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-08/pdf/2021-07193.pdf https://regulations.justia.com/regulations/fedreg/2021/04/08/2021-07192.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Law Enforcement Officer Flying Armed Training 2021-04-08T00:00:00-07:00 2021-04-08T00:00:00-07:00 2021-07192 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-08/pdf/2021-07192.pdf https://regulations.justia.com/regulations/fedreg/2021/04/08/2021-07191.html Notice - Intent To Request Revision From OMB of One Current Public Collection of Information: Critical Facility Information of the Top 100 Most Critical Pipelines 2021-04-08T00:00:00-07:00 2021-04-08T00:00:00-07:00 2021-07191 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-08/pdf/2021-07191.pdf https://regulations.justia.com/regulations/fedreg/2021/04/08/2021-07190.html Notice - Intent To Request Extension From OMB of One Current Public Collection of Information: Military Severely Injured Joint Support Operations Center (MSIJSOC) and Travel Protocol Office (TPO) Programs 2021-04-08T00:00:00-07:00 2021-04-08T00:00:00-07:00 2021-07190 Notice https://www.govinfo.gov/content/pkg/FR-2021-04-08/pdf/2021-07190.pdf https://regulations.justia.com/regulations/fedreg/2021/03/03/2021-04335.html Notice - Extension of Agency Information Collection Activity Under OMB Review: Imposition and Collection of Passenger Civil Aviation Security Service Fees 2021-03-03T00:00:00-08:00 2021-03-03T00:00:00-08:00 2021-04335 Notice https://www.govinfo.gov/content/pkg/FR-2021-03-03/pdf/2021-04335.pdf https://regulations.justia.com/regulations/fedreg/2021/02/24/2021-03723.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Transportation Worker Identification Credential (TWIC®) Program 2021-02-24T00:00:00-08:00 2021-02-24T00:00:00-08:00 2021-03723 Notice https://www.govinfo.gov/content/pkg/FR-2021-02-24/pdf/2021-03723.pdf https://regulations.justia.com/regulations/fedreg/2021/02/12/2021-02929.html Notice - Intent To Request Approval From OMB of One Current Public Collection of Information: Screening Partnership Program 2021-02-12T00:00:00-08:00 2021-02-12T00:00:00-08:00 2021-02929 Notice https://www.govinfo.gov/content/pkg/FR-2021-02-12/pdf/2021-02929.pdf https://regulations.justia.com/regulations/fedreg/2021/02/11/2021-02806.html Notice - Revision of Agency Information Collection Activity Under OMB Review: Sensitive Security Information Threat Assessment Application 2021-02-11T00:00:00-08:00 2021-02-11T00:00:00-08:00 2021-02806 Notice https://www.govinfo.gov/content/pkg/FR-2021-02-11/pdf/2021-02806.pdf