O&D: How fast from the gate to the city? If the fastest way is a train, how good, fast, reliable, and easy-to-use is the train system? If I need a rental car, is that easy to do? Can I walk directly to a Hertz #1 Club Gold or a National Executive Selection area and get into my car? Or do I have to jack around with a bus? If it's a place where everybody uses cabs, are those easy to get, do they take credit cards, and do people have to queue up to get a cab?

On the return, is it easy to dump the rental car and walk to the gate? Is the traffic to the airport unpredictable? (Assume pretty much all airports are easy if you're using a cab back to the airport.)

Connecting: Is there a good lounge for alliance elites? Decent food, shopping, etc.? I care less about all of this in the U.S. where my connection is likely short and I don't have lounge access. More important on long-haul to long-haul where I might be on the ground for a few hours. Ambiance and generally being in a clean, up-to-date airport become a bit more important.

Does the airport have any unusual but consistent flaws? For example, a known bottleneck at the security checkpoint or a reliance on inefficient buses to move people around between terminals or to/from aircraft. (Trains, like at DEN, don't bother me as much. They're usually predictable and arrive every minute or two.)