Go back and forth in NASA craft (7)
I believe the answer is:
shuttle
'go' is the definition.
(shuttling is a kind of going)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for shuttle that I've seen before include "Transport plying back and forth" , "Vehicle plying between two points" , "Commute" , "Space vehicle" , "Transport plying to and fro" .)