CHICAGO -- United Airlines' inaugural flight of Boeing's 787 Dreamliner has touched down at Chicago's O'Hare International Airport.

United is the first U.S. airline to get Boeing's newest plane. United CEO Jeff Smisek was on Sunday's flight from Houston to Chicago and called the 787 the "world's leading airplane."

It was a long time coming, as Boeing recently started delivering the jets after more than three years of delays.

More than 800 have been sold to airlines around the world, which Boeing has said will be more fuel efficient than comparable jets and more comfortable for passengers.

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  • The interior of the new Boeing 787 Dreamliner aircraft control room is shown, after the plane arrived at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • United CEO Jeff Smisek, left, looks outside after United's inaugural revenue flight of its Boeing 787 Dreamliner arrived at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • An upgraded video screen on the back of a seat of United Airlines' new Boeing 787 Dreamliner is shown after the aircraft's inaugural revenue flight from Houston to Chicago, at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • The interior of United Airlines' new Boeing 787 Dreamliner is shown after its inaugural revenue flight from Houston to Chicago, at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • A United Airlines 787 Dreamliner arrives at O'Hare international Airport. (AP Photo/Nam Y. Huh)

  • (AP Photo/Nam Y. Huh)

  • Onboard United's Inaugural 787 Flight

    Pan over the cabins on United's inaugural 787 flight from Houston to Chicago