I managed to create a fleet with more ships that what should be allowed. Early in the game, I was testing how many ships I could put in orbit around a planet. My logistics was 10, so I could have 5 tiny hulls in fleet. When I got 6 tiny hulls around a planet (12 logistics), I decided to launch them all at once. I got a fleet that required 12 logistics points when I had only 10 to give. Later, I did something similar when I was working with small hulls, getting a fleet with 15 logistics when I could only offer 14.

In later games, I abused this and ran around with fleets that had more than double the number of ships than what I should be allowed to have. I really don't need to give a damn about logistics.

If people don't already know, you can select multiple ships orbiting a planet, starbase, or shipyard at once. If you order a bunch of them to launch at the same time, they will be launched as a fleet.