Like some space flights (6)
I believe the answer is:
manned
'like some space flights' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for manned that I've seen before include "Supplied with people for service - men only" , "Having a human crew" , "Provided with workers" , "Crewed" , "Staffed" .)