Turkish Airlines is to add four Airbus A320 second-hand aircraft under operating leases.
The aircraft will be leased for a period of six years from Wells Fargo Bank Northwest National Association, the Star Alliance carrier says in a statement.
Last month Turkish Airlines revealed plans to order up to 117 Airbus single-aisle aircraft in a deal that includes the current version of the A320 and the re-engined A320neo family.
The carrier's board of directors announced a firm order for 82 A320 family aircraft along with 35 options. The firm order comprises 25 A321s, four A320neos and 53 A321neos with deliveries due to begin in 2015. The airline has also taken options for 35 A321neos.
According to Flightglobal's Ascend Online database, the airline currently operates 76 A320 family aircraft. The majority of these are powered by International Aero Engines V2500 engines, although a small number are equipped with CFM International CFM56s.