Korean Air has firmed an order for 20 Boeing 787s, finalising a letter of intent the carrier signed last month at the Paris air show.
The order includes 10 787-9s and 10 787-10s and has a total list price value of $6.3 billion.
Boeing has not said when it expects to deliver the aircraft to the Seoul-based airline.
In Paris, Korean also signed an agreement to lease 10 787-10s from Air Lease. It already operates 10 787-9s.
Its widebody fleet also includes 23 747s, 56 777s, 10 Airbus A380s and 29 A330s, according to Cirium's Fleets Analyzer.