I recently drove a family to the airport for a long-haul flight, and the child had been running a fever fewer than 24 hours earlier. Fearing that more sick germs might be jetting across the country, I felt a bit like an accomplice to a crime.

Germs are a part of life; they just get concentrated on airplanes, where lots of people share a small space. They swirl in the air, lurk in seatback pockets and coat tray tables on airplanes everywhere. One study found that "the evidence appears to suggest that aircraft passengers do indeed develop colds with a higher than normal frequency in the week following their flights." Other studies have uncovered viruses in planes' bathrooms and on tray tables.

The good news is that unless you're seated by a sick person who sneezes your way, you can arrive in your destination with your luggage, your sense of adventure and nothing more -- such as a budding flu.

Here are my top rules for flying: Wipe down all surfaces such as armrests and tray tables with disinfecting wipes. Shun the seatback pocket -- just think of what's been in there. Stay hydrated in the relatively dry air of a plane by drinking lots of water, avoiding dehydrating beverages such as alcohol and coffee, and using a saline nose spray. Do not touch your eyes, nose or mouth. Wash your hands frequently, relying on sanitizing lotion in your seat. In an airplane bathroom, touch faucets and door handles only with the barrier of a paper towel.

As for my friends, they would have paid oodles to change their tickets. Until the airlines give relief to the suddenly ill, sick people will fly.

Send your questions or tips to travel editor Kerri Westenberg at travel@startribune.com, and follow her on twitter @kerriwestenberg.