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Making the world better, one answer at a time. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense.
An airplaneâs drag is the backward resistant force obstructing an object from moving forward. A thinner design works best for paper airplanes because it fundamentally creates less material to drag the plane, while thicker designs will create more resistant force to impede the planeâs flight.