COS is mostly United CRJ200. They do have some CRJ700 flying as well. I'd take a guess that the 700 flying is only 10% of the flying. The majority of trips are three days that start around 6am on day one and finish around 8-10pm on day three with credit around 16-18 hours. That means you'll probably do five of them a month in order to get around the 88 minimum hours of credit the company wants everyone to have. The do have 1, 2, and 4 day trips as well. Making a wild as guess those comprise 30% of the flying.

On the 200 you'll see a lot of Denver. The 700 goes farther. There is a small amount of Delta 200 flying that goes to SLC hub.

I believe one of the big benefits to COS is being able to park your car in the parking lot and walk to your airplane in 5-10 minutes. At other places car to the aircraft can take up to an hour. Even in SLC I have to plan to be in the parking lot nearly a half hour before showtime. LAX can be a headache with the bus service to the United terminals. And Denver airport is in the boonies.