Editor's note: They’re among the top 20 airlines of the world’s 380-plus carriers. Their MileagePlus program is popular for getting free flights, being able to pay for flights with a combination of money plus miles, or applying all those points to some high-end shopping. Their slogan is “Fly the Friendly Skies” and, although it’s not a luxury airline, a little friendliness certainly helps on a stressful travel day. Enjoy some United Airlines wallpapers and safe travels!