Originally Posted by
thefilipinotraveler
... so I believe that there must be I class availability (just like what the TK agent told us) to redeem a business limited seat for 45k miles Europe to Asia and apparently to use the elite plus voucher. I'll get a new elite plus upgrade voucher on April 1 and will try to use it for a trip and will report back
This is a bit weird since I successfully upgraded (with miles) my IST-LAX flight on Feb 27 and during the discussion with my local TK office they confirmed that they needed "J" availability to be able upgrade it, I don't recall with certainty if it had "I"availability as well, but I do not believe so.