Tim flies airplanes, but not passenger planes. He doesn't have to worry about passengers. All he has to do is what?\nOptions:\n- arrive late\n- teach\n- catch on fire\n- taxi\n- carry freight
Let's think carefully first. Step-by-step reasoning process:
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An airplane that does not carry passengers carries freight. Freight means the goods transported in bulk by an aircraft. So the final answer is carry freight.
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