Avengers: Infinity War was originally going to see Falcon in space instead of Spider-Man, writers Stephen Markus and Christopher McFeely revealed.
In the end, the Russos, as well as Markus and McFeely ultimately grouped the Avengers: Infinity War characters in a way that makes the most sense.
“There was one [version] where Spider-Man did not go to space, and where Falcon went to space.
Speaking with Yahoo! with regard to some of the early ideas they had for Infinity War, the film’s writers revealed that at one point they were sending Falcon to Titan instead of Spider-Man.