Here are the different combinations to make a hangar in Alchemy 2.

airplane + barn
airplane + container
airplane + house

airplane + wall
barn + helicopter
barn + rocket
barn + seaplane
barn + spaceship
container + helicopter
container + rocket
container + seaplane
container + spaceship
helicopter + house
helicopter + wall
house + rocket
house + seaplane
house + spaceship
rocket + wall
seaplane + wall
spaceship + wall