Right - this "ErrorPrice for your trip has changed. New quote is displayed below. (8015)")

After booking my outbound (oneway) via website with nary a catch - the return leg (same partners) refuse to participate, and kept doing the Error Price thing.

That's when I checked this forum - and many of you said - "CALL" - so I did - and that was that! It all worked out - kinda unfortunate about the error - but - my experience on their website is that if everything is
good, then you can do as you please - but - if there's any discrepancy - say, the airline you chose has no flights on that day at all - then the whole website pukes. For instance, choose a flight from Europe to a USA destination - one on the drop down - but one that does not truly have a flight. For instance, Charlotte got rid of some Euro nonstops recently - but Charlotte still appears on the drop down.

In my case the "error - price..." was fortuitous - the fees (in HKD) actually were about half of that posted - but the website was unable to navigate that - so Phone Call it was. I will try whatsapp next time if needed!

Anyway - thanks again.