I always try to schedule my FDT through secondary airports (COS instead of DEN, ABE instead of PHL/EWR, etc). YMMV but it's in my experience that unless you are a local, nobody actually want's to go to these airports so you're chances of making the flight are greater. I have found that if you can make your flight to whatever hub you're flying to, you have a much greater chance of making it to your destination from there. The only time I've had an issue is when I'm going hub-hub.What airport? I've always been curious how most people fair trying to get through some of the big hubs?