What Aircraft Does NASA Use Besides Its Boeing 747 Telescope?

When it comes to aircraft (the kind that returns back once it takes off), the National Aeronautics and Space Administration (NASA) of the US is known mostly for its Space Shuttle, the Boeing 747 that used to carry it around on its back, and its flying, infrared telescope SOFIA. However, there is more to the NASA fleet than that.

This is a companion discussion topic for the original entry at https://simpleflying.com/nasa-aircraft/