(Reuters) - United Continental Holdings Inc said it will buy 100 Boeing 737 MAX 9 aircraft and fifty 737-900ER planes in a deal that Boeing valued at $14.7 billion at list prices.
United Continental, the holding company that owns United Airlines, the world's largest carrier, said it will begin taking delivery of the 737 MAX 9 planes in 2018.
The order for the 100 MAX aircraft was expected as it was reported by Reuters in May. The 737 MAX is a new-engine variant of Boeing's Next-Generation 737.
The additional order for fifty 737s, which will be delivered from late 2013, reflects efforts by both Airbus
"These new aircraft will allow United to replace older, less-efficient aircraft to reduce fuel and operating costs, United said in a statement.
United shares were down 3.4 percent at $23.94 in morning trade on the New York Stock Exchange. Boeing shares were little changed at $71.55.
(Reporting by Bijoy Koyitty in Bangalore; Editing by Joyjeet Das)