Home Trip Ideas FAA: One Billion Fliers a Year by 2021! FAA: One Billion Fliers a Year by 2021! By CNN News February 15, 2011 Advertisement Save Pin FB ellipsis More Tweet Mail Email iphone Send Text Message Print CNN | Feeling crowded at the airport and on your flights? Get ready to have even more company when flying. Air travel in the United States is expected to more than double in the next 20 years, according to the Federal Aviation Administration's annual forecast released on Tuesday. It also predicts U.S. airlines will carry 1 billion passengers a year by 2021, a milestone that will come two years earlier than previously thought. (To put that number into perspective, about 712 million passengers flew on domestic carriers in 2010.) READ MORE Photo by Don Wilson/Courtesy of Port of Seattle.