There are extensive federal regulations covering airplanes and pilots.Assume that the state of Missouri passes a statute containing numerous requirements,some conflicting with the federal rules,covering the licensing of airplane pilots and the operation of aircraft.A pilot's constitutional challenge to this state statute would most likely succeed on the basis of:

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The preemption doctrine holds that federal law, including federal regulations, supersedes state law in areas where Congress has expressly stated its intent to occupy the field or where state law conflicts with federal law. In the case of airplanes and pilots, federal regulations extensively cover these areas, meaning that Missouri's state statute containing conflicting requirements would likely be preempted by federal law. As a result, the pilot's constitutional challenge to the state statute would likely succeed based on the preemption doctrine.

There Are Extensive Federal Regulations Covering Airplanes and Pilots