When you buy a new plane but all of your hangars are occupied, you are suggested to place it in a hangar that is appropriate for this type of plane. The plane from this chosen hangar goes to the reserve one. To get it back, you will need a free hangar that suits this type of plane.
You can also place any plane to the reserve hangar, if you have a place there: open your reserve hangar, tap the Use button, choose a hangar and confirm your choice to move the plane in it.
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