I have to say I've never had better success with upgrades, on both domestic and TATL flights. To the point I only have two upgrade credits left as of this morning. A trip to the States next week should bring another 10 credits. I'll be living on these threshold bonuses for the rest of the year.
This time last year, I think I only rode up front two or three times. Same routes, same rough dates. I can't explain.