United Airlines said it will buy another 25 new Boeing 737-700 aircraft in addition to its recent order for 40 jets.
United will take delivery of the planes from the end of 2017.
"The new 737-700 aircraft are ideal for our fleet as we continue to reduce our reliance on 50-seat aircraft," said Gerry Laderman, United’s senior vice president of finance.
"Retiring the 747 fleet and replacing those aircraft with more customer-pleasing, current generation aircraft creates a more reliable and efficient fleet
United’s 747 fleet will be retired from scheduled service by the end of 2018, it said.
United said it expects to have no more than 100 aircraft left in its 50-seat fleet by 2019.
