Not wanting to be an AMA "knowitall" but it is commonly understood that we operate with a 400' ceiling. In model rocketry circles (which is monitored by the ATF for the larger +D engines) one needs to aquire a waiver for altitude activities. Still in all circumstances the full scale has right of way regardless of how low or what permission you have. There is a human on board the full scale. Think how bad your luck would be if they sucked your plane in and then crashed into you.