ABC Montana: Halloween Prop Shuts Down Airport Glacier National Airport in Kalispell was shut-down for an hour on Sunday thanks to a prop for a Halloween party.TSA screeners called the County Sheriff when they thought they found grenades in a passenger's luggage. Flathead County Sheriff Chuck Curry said fire crews immediately responded and determined the grenades were not real."There was no danger to the public. The airport was evacuated for about an hour. We did interview the lady who had placed them into her checked baggage. She had planned on using them for a halloween props for a halloween party," Curry Said.