I noticed quite the difference the humidity made when I was in Switzerland recently (much drier inside compared to GA). Also, drink a lot of water when you are flying.
I finally got a humidifier here and it helps. Of course you want avoid breathing through your mouth. (See Brians email to that effect).

M

Partial glossectomy (25%) anterior tongue. 4/6/07/. IMRT start @5/24/07 (3x) Erbitux start/end@ 5/24/07. IMRT wider field (30x) start 6/5/07. Weekly cisplatin (2x30mg/m2), then weekly carbo- (5x180mg/m2). End of Tx 19 July 07.