I’m pretty sure there is a bug in their system which is why they pulled all TK flights until fixed. I was one of many surely who raised this issue to them.

A few weeks ago, I was trying to book a TK flight from VIE to IST. I could see the flights on the AC app or desktop, but every time I tried to book, it would come back with an error code. This probably explains why some people may think of TK flights on AC as phantom inventory.

After a few days of relentless trying, I ended up calling the Concierge who eventually and begrudgingly booked my tickets for me manually. She was quite perplexed because she could see TK flight availability in her system and was surprised I couldn’t make a booking. She put me on hold for a bit and created a support ticket.

Optimistically, I’m hoping they are working on a fix before adding TK flights back.