Avengers' Quinjet
A Quinjet modified by Tony Stark for the use of the Avengers as their primary mode of transportation.
In addition to enhance offensive capabilities, the quinjet possessed cloaking technology, and the wings were modified to fold inward in order to allow the Quinjet to fit inside the launch bay of Stark Tower
Although not primarily designed for it, the Quinjet has been shown to be capable to space-flight.
Original Timeline
In the original timeline, the Quinjet was taken by Bruce Banner during the Ultron Offensive, and eventually crash-landed on Sakaar.