United Airlines Monday announced an order for 30 Embraer 175 jetliners as it updates its fleet of regional aircraft.
The US airline did not disclose the price of the purchase.
The planes, built by Brazil's leading aircraft maker, will be added to the fleet of United Express. Flights are operated by partner carriers under the United Express brand.
The Embraer 175 jet will be the first 76-seat regional jet aircraft in the United Express fleet and consume 10 percent less fuel per seat than the current fleet of 50-seat aircraft, United said in a statement.
"With a large first-class cabin, wider fuselage, and larger overhead bins, this aircraft brings an improved regional flying experience to our customers," said Jim Compton, United's vice chairman and chief revenue officer.
United said it expected to take delivery of the aircraft in 2014 and 2015.
Embraer, in a separate statement, said that it had signed a firm order with United Airlines for the sale of the 30 175 jets, with options for an additional 40 of the same model.
If all options are exercised, the combined order for 70 aircraft has an estimated value of $2.9 billion at current list prices, the Brazilian company said.