Not all airlines have individual air nozzles on all their planes and that's a no-go for me. I've never found a reliable source to check this information, it would be a huge enhancement to Seat Guru. If I can't get air flow I perish.

All UA INTL birds (as far as I know) have nozzles.

I've found that Lufthansa tends to keep their planes hot, too hot for me. Not TATL, but I've been able to pursued SQ to lower the temp when asked.