If you're in the mood to miss your flight out of Bozeman or sit around the gate area for an extra 45 minutes before your flight - ask a local what time you should show up at the airport. There's a very decent chance they'll give you crappy, non-detailed, and not particularly accurate advice.
Just recently, the Bozeman Yellowstone International Airport has complete two very important projects. The projects together cost around 23 million dollars to complete.