Yeah, the thing is since V cast Overland Flight on himself at the beginning of the day, that leaves one fly spell left. (The one cast on Haley later.) If the IFCC did replenish spells, that would leave one Overland Flight, and one Fly spell left, while the original Overland Flight from that morning would still be going on.
You could argue that V was being 100% literal by "Fly spell", however since Overland Flight functions like a Fly spell, and they were figuring out trying to escape. I don't see why V would not include an Overland Flight, and cast it on Elan/Haley when the time came.
With that being said, since V does not have a left over Overland Flight(Since it would have benefited in the predicament of trying to escape the army), I think this proves that the IFCC did not replenish V's spells.