The fleet now consisted of the Intrepid, Constitution, United States, Washington, Eagle, Excelsior, and the original Union. The balloons ranged in size from 32,000 cubic feet (906 cubic meters) down to 15,000 cubic feet (425 cubic meters).

I'm trying to remember... in one of the Star Trek movies or series, they had a room with pictures or models of all the ships that had been named Enterprise. Was one of them a balloon?