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Yes there's some amt of buoyancy acting below the aeroplane by the air. Due to the shape of the aeropleane. It is shaped to float in air. It is fully aerodynamic. We can prove it as the proof is the aeroplane flying...
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because air is also a fluid( a object which flows)
since b.f acts on object which flows so air also exerts b.f
plus it exerts air resistance also in the form of air friction
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