As of 2023, NASA operates a fleet of approximately 40 active aircraft, including:

Fixed-wing aircraft:

* Boeing 747SP: 1

* Boeing 737: 1

* Gulfstream III: 1

* Gulfstream V: 2

* UC-12B King Air: 3

Helicopters:

* Sikorsky S-333 (CH-53E): 2

* Sikorsky UH-60 Black Hawk: 1

* Eurocopter AS350B3 AStar: 1

Cargo aircraft:

* Lockheed C-130 Hercules: 2

Experimental aircraft:

* Boeing X-59 Quiet Supersonic Transport (under development)

* Lockheed Martin F-22 Raptor (for research purposes)

* Northrop Grumman RQ-4 Global Hawk (for research purposes)

It is important to note that NASA also has a number of retired aircraft, including the Space Shuttle, which were used for specific missions and are no longer in active service.