Space mission

A space mission was any a type of mission that required space travel in order to carry it out.

When Superman, Batman, Robin, Wonder Woman and Aquaman were all kidnapped by Doctor Hiram Gulliver, Marvin White and Wendy Harris decided to call Green Arrow to help rescue them, because all of the other members of the Justice League of America were on a space mission, too far away for them to call by radio or telephone.