No agreement is yet clear, but discussions about technical details are ongoing, according to the sources.
NATO country Turkey has the world's second largest fleet of the American fighter jet F-16 and has never used other foreign fighter jet models.
An upgrade to new F-16 aircraft is not expected to be able to begin until 2030 and Turkey has expressed an interest in expanded defense cooperation with Europe.
In July, Turkey signed a preliminary agreement with the United Kingdom to buy 40 Eurofighter Typhoon fighter jets.
