55 passenger jets were ordered by General Electric Co.'s aviation subsidiary from Boeing Co.
Financial terms of the deal were not disclosed. Boeing said the list price for 53 single-aisle 737-800s and two extended-range versions of the widebody 777-300 is $4.5 billion (3.06 billion EUR), but customers typically negotiate steep discounts.
The order, which Boeing added to its online order tally last week, was previously attributed to an unidentified customer.
GE Commercial Aviation Services, GE's U.S. and Irish commercial aircraft financing and leasing business, is the world's largest owner of 737s. It currently has 309 of the single-aisle planes on order.