Here's how you can adopt the same strategies

Aeroplanes are pretty gross. Between a lot of people, and even more germs, you should definitely think twice before touching the air vents on a plane. Flight attendants don’t have much of a choice in the matter, though, and are constantly exposed to a barrage of bacteria. Yet somehow, they never get sick.
If you’re the type of person who feels sick after a single one-hour flight, you may be wondering how cabin crew members manage to stay healthy, despite being incredibly frequent flyers. Well, wonder no more, because several flight attendants have revealed how they never get sick at work and how you can adopt the same strategies.
Stay hydrated

Cabin supervisor, Taylor Strickland, has only called in sick once during her career. Her top tip? Drink “a tonne of water” while flying. “It’s dehydrating to fly, and if you’re dehydrated, your body’s a little weaker, which makes it harder to fight off the germs you’re encountering,” she tells Reader’s Digest. Similarly, Lauren Guilfoyle, a cabin crew member for Emirates Airline, says that she buys a litre of water before each flight and drinks it during the trip.
Find out the ways your body changes when you start drinking enough water.
But avoid tap water, coffee, or tea

Even though you should definitely stay hydrated, it’s best to avoid these beverages. Among other things, a 2015 study on the water quality on aeroplanes found that the water tanks are ‘conducive to microbial growth’. Instead, ask for bottled water or bring your own.