Correct - the hanger can only accommodate the biplane. That having been said, in order to accommodate the other aircraft too the hangar would have to be huge, with an enormous footprint, and a substantially increased parts count. As a result, I'd estimate a price up to double the current RRP which I suspect few of the target market would pay. LEGO therefore got the size of the hanger right IMHO.
Pack your bags and get ready to go on vacation! Head to the airport and check in at the terminal. Put your luggage on the conveyor belt and watch it get loaded onto the passenger airplane. Go through security and then head out the revolving doors to the loading area. Climb the stairs and get buckled in, your trip is about to start! This creative play building toy includes 6 minifigures.