Originally Posted by
airoli
There doesn't need to be a published J fare for your route, but there needs to be J class availability on the entire trip component you are looking to upgrade. Given that TK manages availability, this matters.
In other words, just seeing J class when looking at ARN-IST and when looking at e.g. IST-HKG is not enough. J needs to be available when looking at ARN-IST-HKG.
Yes, but even if TK won't publish a J fare for ARN-IST-HKG-IST-ARN, they might do so for a HKG-IST-ARN-IST-HKG. In which case there should still be J inventory to upgrade into, irrespective.