Okay gang, here's a tough one. I am looking at a TK award flight DPS-IST that has space available on ExpertFlyer. It is showing up on TK, NH, A3 and OZ web sites but not available on UA, SQ and AV (Lifemiles). No availablity, like this flight doesn't exist (nothing in economy, nothing in business). Any wild guesses? New airport IST/ISL mixup although I can find other TK flights just fine on all programs?

Even called SQ to check and they didn't see the flight.

Any ideas?