Actually, we see that rather often in the series. Starfury wings were deployed several times, (I can't quote episode names,) from Babylon 5 independant of any carrier or even any capital ship support to investigate raider attacks, among other things. Similarly, it was a squadron of frazi that discovered the remains of ragesh three, and they had arrived with no capital ship support. As I remember, in a couple of these occasions these fighters travelled several jumps away on trips lasting many hours to perform their duties. Now, also take into account that in a formation containing ships that have fighters, but are not 'fleet carriers' you could rotate squadrons in and out of the ships in order to resupply, rest, etc. and not all fleets really require a fleet carrier at low priority level, and would be quite capable of supporting wings included in a support capacity.