The Merlin engine in the upper stage of the Falcon 9 during its first burn on the Sept. 28 Crew-9 launch. The engine suffered an “off-nominal” burn when later deorbiting the stage. Credit: NASA ...

Once Elon Musk decided to build a reusable spacecraft to carry his dreams of Martian colonization, the engineers at SpaceX knew they would need a special engine for the world’s most powerful rocket.

There is a list of 43 aircraft that have used Merlin engines on the Rolls-Royce Merlin page on Wikipedia, here's the link to the list: https://en.wikipedia.org/wiki ...