There can't be that many commercial flights out of MSO but what about tracking flights in and out through FlightAware or another tracking site? There is a lot of info on the FlightAware site that might be of interest to the kids - especially the timing of arrivals and departures. Outside with binoculars!

I don't know if the web has access to private flights, but maybe it is out there somewhere. Military, I bet not.

Cheers,
Pogopossum