I was a Columbus FF until last year and loved it. Cheap fares, easy flights and hands down the best ground staff anywhere in the world--yes, I flew United!

Having moved from SoCal to CMH I just kept flying UA because of status and couldn't have been happier. The staff quickly began to recognize me, not sure if that is good or bad, and treatment was fantastic. For me UA was great because my travels were so erratic that almost anywhere I needed to go I was able to get there in one stop through ORD.

Towards the end of my stay there I started really flying to the southeast a lot and began to take USAir to get me there. With that said, if you are flying to places that CO serves easily than I wouldn't switch away from them-they are every bit as good as any other. However, if you are often flying to Denver or Atlanta or a hub city of another airline it might be worth looking into a switch. While I loved UA, and still did get MP miles, flying UA to where I was going in the Carolinas or Florida would have been difficult given their schedules and routes.

As for things to do between 12am and 6am--not much. Easton is a decent choice as it is close to the airport, but they close the bars at two or earlier given the day of the week. If it is a Th/Fr/Sa you can go downtown and have a good time until 230am or so. Jump a cab north a couple of miles to the OSU campus for a late night meal and head back to the airport when full. Just be advised that the terminals close for inbound passengers after the last flight leaves. No one is let in until the next morning (4am?). Once the last flight arrives in that terminal they also round everybody up and place them in the common, unsecure area, so don't plan on getting comfy in a quiet corner for the evening.