Build a fairly large fleet of planes consisting of five or more bombers, fighters, stealth bombers, etc. Then, put them all into one city and build a carrier. After that, move the carrier into the square you want to land the extra planes that the carrier cannot hold. Finally, press the button that moves units of the same type from that stack (located above the info box) and land them on the carrier. Then, move the carrier and all the extra planes will be flying in the middle of the ocean. Note: The planes will remain there until you tell them to move to another place.