In the starting scene of the movie Kong Skull Island we can see a whole bunch of helicopters being deployed off the deck of a freighter. As I count there are: 9x UH-1 Iroquois (main deck), 1x CH-47 Chinook (front deck), and 1x CH-53 Sea Stallion (rear deck).
plus supposedly 3 more UH-1s for the final rendezvous (These don't seem like a problem as a later scene shows them parked in the rear hanger). Those 9 are supposed to fit on the main deck and they probably would if it was for storage. But considering the space needed for the blades to rotate when they are turned on, is it really practical?
Now its obvious they had to take turns to take off, but if the deck is completely occupied at first that won't also work. The model of the ship and its specs could also she some light on the situation.