Drive.
It's tough, but I try to keep myself out of "compromising" positions - I travel for business but certainly keep a very low profile - casual business attire, smile a lot - but not too much, try to stay pleasant and business-like at all times. Not loud, but not meek, either.
Fly under the radar for crying out loud - an airport is not the place to let your "freak flag fly", not even before 9-11, and certainly not now.