Originally Posted by
freedom2020
I understand that logic. However in my case, there is no "non stop" flight between SFO-NAV. And the SFO-IST flight is at a premium but not the domestic routes. I don't think they will lose anything by switching the 2nd leg.
Your thinking is not uncommon, but there has to be SFO-IST-NAV award space available today. You aren't just changing destination, but effectively cancelling one itinerary and booking an entirely new one.
And FWIW, TK has a monopoly on SFO-NAV while it has competition on SFO-ADB. It's not about the domestic route but the start to end itinerary.