TK is in the process of studying data from the 777x and other ultra long haul aircraft for a potential order. While the TK executive is not a quoted specifying the 777x, I see this RFP similar to that of SQs RFP. What's interesting is that he suggests a small trial order to before a large order to follow.
Following the feasibility study, the airline may look into a "trial" order to try out the aircraft within its fleet before potentially making the "main" order, Mr Ayci said.
A trial order sounds to me they want to lease first, short term, perhaps from another airline. They did that with their 77W's too, leasing surplus aircraft from Jet Airways.
So which airlines have A350s/777X on order and potentially have ordered too many? (cough Etihad cough)
146,318/19/20/21, AB6,332,333,343,345,346,359,388, 722,732/3/4/5/G/8,9, 742,74E,744,752,762,763, 772,77E,773,77W,788 AT4/7,ATP,CRK,E75/90,F50/70