Lizard Ban$]$ ?The Federal Aviation Administration has banned the presence of giant lizards on airplanes. Corina has a business training lizards for use in television and movies. Her star lizard, a massive iguana named Izzy, likes to have her own seat on the airplane. In order to promote her business, Corina has asked her home state of Montana to pass a law permitting giant lizards on airplanes.

Under what circumstances may Montana regulate the same subject matter as the federal government?