It's defiantly possible to do. I agree with
@sprzout, it would be a very bad idea to try, not at all safe. Even if the two planes were identical, the wind each would encounter would be slightly different. They would soon be out of sync and each need different inputs.
Here is an old school idea. The planes are all joined with wire or CF tubes, 4 planes flown in formation. One plane controls the throttle, one is left aileron, one is right and one is elevator.
Looks cool but is hard to pull off.
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