Keilantra spots an airplane on radar that is currently approaching in a straight line, and that will fly directly overhead. The plane maintains a constant altitude of 7500 feet. Keilantra initially measures an angle of elevation of 19^{\circ}
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to the plane at point AA. At some later time, she measures an angle of elevation of 34^{\circ}
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to the plane at point BB. Find the distance the plane traveled from point AA to point BB. Round your answer to the nearest foot if necessary.