Currently it is "We Know Why You Fly"
American Airlines
United Airlines used this as their slogan - Fly the Friendly Skies of United.
United Airlines used this slogan in the past.
'A great way to fly'
our's punchuality your destination
The Emirates Airlines. (In advertising, the slogan is "Fly The Emirates".)
Continental Airlines
Western Airlines
It is currently as of April 2011 "Keep Climbing"
United Airlines
"If man were meant to fly, God would have lowered the fares" was the slogan of American Coach Lines. By this slogan, they were attempting to attract customers away from airlines and toward their bus transit line.
American Airlines was created in 1934.