It's all what the mainline partner puts into it. Look at Eagle's gates in JFK, LGA, BOS. All jet bridges and a well laid out ramp not subject to the same problems that Comair is. Granted, the number of flights for Eagle vs Comair into these airports at a certain time might be vastly different, I have no idea.

If Delta was really concerned with misconnected passengers, they'd put money into fixing their terminal situation at JFK. Granted, in this economy, that might be tough to do.

Does anyone really think its going to get better in the summer when Delta starts Terminal 4 operations and now passengers will have 3 separate terminals to transit between flights?