I'm reminded of a Beverly Hillbillies episode when Drysdale finds out Granny has a miracle cold remedy. He thought he had found a million dollar drug which could cure a common cold. At the end of the episode, they ask Granny how it works. She said "Drink this, get plenty of rest and sleep and in about two weeks you will be just fine".

I never get sick when I fly, but I used to until I really changed how I do things. Here's what I do:

* Take Emergen-C, preferably two packets a day. I take these daily regardless of my travel schedule.
* Take and eat anti-oxidants as a regular part of my health regime.
* Take Cold-Eeze (TM) brand zinc lozenges. Yes, the form of zinc is important, and this is the form that was tested and found to reduce colds.
* Wash hands frequently, and never touch my eyes or nose with my hands unless they're been scrupulously washed first.
* Wipe down all touched surfaces in my seat area, including the IFE pad, the seatbelt buckles, & the armrest. Yeah, I sometimes feel a little weird doing this, but hey, it works, and as Guy Betsy said, you should see what the wipes look like after - yuck!
* I also take a Fisherman's Friend throat lozenge after boarding and just before descent to prevent ear-popping. It helps to open the nasal/ear passages - not sure if this helps with cold-prevention, but it's part of my routine.

Hope that helps ~ Happy new year!