When you fly do you ask for a blanket or a pillow?  Do you use the restroom on the plane?  Do you read the SkyMall?  This might make you think twice or at least pack a bottle of hand sanitizer (1 0z or less of course) in your carry-on.

#1.)  The bathroom. There are germs on basically every surface, usually including E. coli.  The bathrooms don't get a full sanitizing between most flights, and the small sink makes it hard for people to properly wash their hands.

#2.)  The tap water. Make sure to ONLY drink bottled water on the plane.  Studies have shown that airplane water filtration techniques still aren't perfect, so you run the risk of drinking some Mexico-quality water.

#3.)  The free pillows and blankets. Sometimes the airlines will have time to change the pillowcases.  But sometimes they won't.

And since about 5% of airline passengers tend to be sick, there IS a chance you'll get a pillow that just got drooled on by a sick person.

#4.)  The SkyMall catalog. Yes, even the beloved SkyMall catalog is trying to kill you, while it sells you lawn ornaments and iPod docks shaped like '50s diner jukeboxes.  People touch the catalog with their germ-filled hands all the time.

(USA Today)

I'm sure the next time I fly, I'll still read the SkyMall.  It's a very entertaining time killer.