| AATE |
Advanced Affordable Turbine Engine |
| AFRL |
Air Force Research Laboratory |
| AirSTAR |
Airborne Subscale Transport Aircraft Research |
| AMELIA |
Advanced Model for Extreme Lift and Improved Acoustics |
| ARMD |
Aeronautics Research Mission Directorate |
| ARTR |
Aeronautics Research and Technology Roundtable, a committee established by the National Research Council’s Aeronautics and Space Engineering Board to provide guidance to NASA on aeronautics issues |
| ASTOVL |
Advanced Short Takeoff and Vertical Landing |
| ATP |
Aeronautics Test Program |
| AvSP |
Aviation Safety Program |
| BWB |
Blended wing body |
| CAEP |
Committee on Aviation Environmental Protection |
| CAIV |
Cost as an Independent Variable |
| CMC combustion liner |
Ceramic matrix composite combustion liner |
| CoCOMs |
Combatant Commands |
| DARPA |
Defense Advanced Research Projects Agency |
| DLR |
German Aerospace Center |
| DSTO |
Australian Defense Science and Technology Organization |
| Ephemerides |
Position and velocity tables for celestial bodies |
| ERA |
Environmentally Responsible Aviation |
| ERAST |
Environmental Research Aircraft and Sensor Technology |
| Full cost recovery | A NASA program that requires all outside NASA customers to pay the full cost of NASA participation in joint programs |
| HIFiRE | Hypersonic International Flight Research Experimentation |
| HIWC | High ice water content |
| HSCT(1283) | High-Speed Civil Transport |
| HSR(1283) | High-Speed Research |
| HTV-2 | Hypersonic Technology Vehicle 2 |
| Hypersonic | Hypersonic, or hypersonic speed, is considered to be five times the speed of sound; also known as Mach 5 or greater. |
| ISRP | Integrated Systems Research Program |
| JSRA | Joint Sponsored Research Agreement |
| MAJCOMs | Major Commands |
| MUTT | Multi-Utility Technology Testbed |
| NACA | National Advisory Committee on Aeronautics |
| NAS | National Airspace System |
| NAVAIR | Naval Air Systems Command |
| NextGen | Next Generation Air Traffic Management System |
| NGLT | Next Generation Launch Technology |
| NRA | NASA Research Announcement |
| PRSEUS | Protruded Rod Stitched Efficient Unitized Structure |
| QSP | Quiet Supersonic Platform |
| RevCon | Revolutionary Concepts program, which was created to encourage innovation in flight vehicle design |
| SCAR | Supersonic Cruise Aircraft Research |
| SOFIA | Stratospheric Observatory for Infrared Astronomy |
| Sonic boom | The sound released by shock waves associated with an aircraft as it travels faster than the speed of sound |
| SST | Supersonic Transport |
| Supersonic | Supersonic, or supersonic speed, is considered to be greater than the speed of sound; also known as Mach 1 or greater. |
| TRL | Technology readiness level |
| UAV/UAS | Unpiloted aerial vehicle/uninhabited aerial system |
| VAATE | Versatile Affordable Advanced Turbine Engine |
| X-factor | A quantitative measure of a program’s level of technological difficulty |