I believe building fighters/bombers requires antimatter for the carrier cruisers
I'll have to test that . . . Wouldn't the UI say the cost per squad?
Making jumps between planets require antimatter (I think around 100 each jump, although I have a theory that the amount required for each jump varies on the distance of the jump).
I seriously doubt that that it
requires A-M. First of all, some ships like the LRM Frigate doesn't even
have antimatter, and often jump when I have zero in my reserves. The colony ship comes to mind, it often has to wait about month just to get enough antimatter to colonize a planet after a jump, and I never leave it lying around after it does its job.