Turkish Airlines Miles&Smiles - USairways reduced mile credit

Last year I flew on USAirways flights and received 100% credit for all the flights. This year, I've noticed that virtually all USAir economy flights are now 50% of the miles flown. The same flights on UA or CO would've been 100%. I emailed USAir about it, and they said it was Turkish Air's decision. I emailed TK, and of course, they completely avoided the question with their canned response that passengers get credit for flights on other *Alliance flights. I emailed TK again and have not received a response back.

Any thoughts on why the sudden, unannounced change and if this will be long term??

Not sure if you've been told the truth ... Generally, i.e. with all airlines, mileage accrual depends on fare class and not on cabin class. So you can get exactly the same service as the passenger next to you - but not earn the same mileage, because you're booked in a different fare class. Obviously the same applies when flying the same route on two different days.

Now in respect of US earning on TK M&S, there seems to be no change recently. The TK M&S webpage is generally doing a good job tracking any changes with their effective dates. As for US, unlike some other *A airlines, there are no changes mentioned.

Then again, if there are changes, this is part of a consensual, contractual process. Simplifying the story, the airline running the FFP tells the airline operating the flight how much one mile costs and the airline operating decides how many miles they want to buy for a passenger in a certain fare class. Obviously, within certain perimeters and policies.

I would think it was TK decision - please remember that when you fly with US, TK must 'purchase' these miles from US. I (as a US FF) earn 100% miles on all US Coach/Economy booking classes.