Bingo. Just thinking the same thing...but on the PLANE. Air recirculation and (unknown to me) maintenance/cleaning of same (or even if they have some kind of anti-XYZ scrubbers)
61 posted on 10/13/2014 7:42:16 AM PDT by i_robot73
(Give me one example and I will show where gov't is the root of the problem(s).)