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 statute would most likely succeed on the basis of:

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The preemption doctrine holds that federal law takes precedence over state law in areas where the federal government has established its authority. Since federal regulations already cover airplanes and pilots, any state law that conflicts with the federal regulations would be pre-empted by federal law. Therefore, the pilot's constitutional challenge to the Missouri statute would most likely succeed on the basis of preemption.

There Are Extensive Federal Regulations Covering Airplanes and Pilots