Boeing beat its rivals to the order and will supply 47 of the long-haul, two-aisle aircraft, in a deal worth more than £8 billion.
American announced the moves Friday.
The 787 widebody order consists of 22 787-8s scheduled to begin arriving in 2020 and 25 787-9s scheduled to begin arriving in 2023, American said.
Once all orders are delivered, American will operate 89 787s.
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The deal is another blow for Airbus, coming just weeks after Hawaiian Airlines dropped an order for six Airbus A330-800neo jets in favour of the 787.
American Airlines has chosen Boeing 787s to replace older aircraft as it doubles its Dreamliner fleet.
The airline will use the 787-8s to replace its 22 767-300ERs, and the 787-9s to replace its nine A303-300s and some of its older 777-200s, it says.
'We are extremely honored that American Airlines is deepening its commitment to the 787 Dreamliner, ' said Boeing Commercial Airplanes president Kevin McAllister in a statement. For further background, check out Boeing's news release and Bloomberg News' analysis.
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As part of the agreement, American said it will defer 40 Boeing 737 MAX aircraft that were to arrive between 2020 and 2022, to "better align with planned retirements of other narrowbody aircraft".
American has been looking at alternatives for the order for 22 A350s that it gained through its 2013 merger with US Airways since a year ago, and recently outlined a need to make a decision on what to do with its aging 767-300ER fleet.
American President Robert Isom and CFO Derek Kerr have made no secret they prefer a streamlined widebody fleet with fewer aircraft types.
Photo Credit: American Airlines will add 47 more Dreamliners, beginning in 2020. It already plans to shed another small fleet of 20 Embraer E190 jets.
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