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.
Did you happen to watch the skies on Monday? It was a constant stream of private jets taking off from Bozeman's airport, heading home to wherever these folks actually live.
Need to get out of Bozeman? How about a week in Hawaii, Portugal, Alaska or Italy where your roundtrip flight costs $500 or less? We found some EXCELLENT prices if you're ready to travel.