| ACT | Access to COVID-19 Tools |
| ACT-A | Access to COVID-19 Tools Accelerator |
| ARMD | Aeronautics Research Mission Directorate |
| CARES | Coronavirus Aid, Relief, and Economic Security Act |
| CDC | Centers for Disease Control and Prevention |
| COVAX | COVID-19 Vaccines Global Access |
| COVID | coronavirus disease 2019, also known as COVID-19 or SARS-CoV-2 |
| EASA | European Aviation Safety Agency |
| EPA | Environmental Protection Agency |
| FAA | Federal Aviation Administration |
| GPMB | Global Preparedness Monitoring Board |
| HEPA | high-efficiency particulate air |
| HVAC | heating, ventilation, and air conditioning |
| IATA | International Air Transport Association |
| ICAO | International Civil Aviation Organization |
| MERS | Middle East respiratory syndrome |
| MERV | Minimum Efficiency Reporting Value |
| NASA | National Aeronautics and Space Administration |
| NASEM | National Academies of Sciences, Engineering, and Medicine |
| OEM | original equipment manufacturer |
| PCR | polymerase chain reaction |
| PEPFAR | President’s Emergency Plan for AIDS Relief under President George W. Bush |
| PPE | personal protective equipment |
| PSP | Payroll Support Program |
| RPK | revenue passenger kilometers |
| SARS | severe acute respiratory syndrome |
| SMS | safety management system |
| TSA | Transportation Security Agency |
| UV | ultraviolet |
| WHO | World Health Organization |