A lot of folks ended up sick Bill. A risk when you travel anywhere. Close contact in airplanes, stale air in hotels, the second hand cigarette smoke is horrible.
I've found Emergen-C to be much more effective than airborne. When I travel I make sure I start taking it before my trip and throughout 3-4 times a day. It's good just to take everyday anyway, lots of extra C!
I often wonder if being that so many of us live in smoke free states, that once we start breathing in that second hand smoke, if we aren't at that much more risk.
As far as the question at hand, I would do either Atlanta or Vegas. As far as NY...I would have to see exactly what they have planned. It's only a train ride for me, but any trip away from the shop has to be a productive one.