Three days after completing its merger with US Airways, the new American said it had inked deals to buy 30 CJR900 NextGen aircraft from Bombardier, and 60 Embraer E175s.
Bombardier said its deal was worth USD 1.42 billion, while Embraer put a USD 2.5 billion value on its order.
American also has options to buy an additional 40 CJR900s and 90 E175s.
American said the 76-seat regional jets ordered will replace less efficient 50-seat jets it currently operates on short- and medium-haul flights.
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The CJR900s, which will be delivered beginning in the second quarter of next year, will be configured with 12 first-class seats, 32 "main cabin extra" seats and 32 regular seats, American said.
The E175s, the first of which will arrive in the first quarter of 2015, will have 12 first-class, 20 main cabin extra and 44 regular seats.
All of the aircraft will be powered by General Electric CF34-8 engines, American said.
"Now that we've closed our merger with US Airways, we can deliver a top-tier regional product that offers a first-class cabin, main cabin extra and in-flight wi-fi -- important elements of an improved flying experience for our customers," said Kenji Hashimoto, American's senior vice president for regional carriers.
Including this latest order from American Airlines, Embraer, the world's third-largest commercial aircraft manufacturer behind Boeing and Airbus, said it has received orders and options for more than 700 E-jets from US airlines this year.
Paulo Cesar Silva, president and chief executive of Embraer Commercial Aviation, hailed the "remarkable order" from American.
"American achieved impressive results with the ERJ145 aircraft family, and we are sure that will continue with the E175," he said.