Originally Posted by ISTFlyer

TK hasn’t adjusted their May schedule yet. There would be interruptions when TK adjusts their schedule.

If you would like to act now, your options would be to reapply the Elite Plus voucher ( if it’s expired, you would lose it ), get your miles back for the upgraded ticket ( if your miles are expired, you would lose it ) and rebook for a flight until 31 December 2021 according to the fare rules and a fare difference might apply.

If you would like to use the open ticket option, you first need to redeposit your Elite Plus voucher and get your miles back for the upgrade ( you lose them if they are expired ). Then when you will use the open ticket, you would be asked for any applicable fare difference and you would still need to complete travel by 31 December 2021.

Also, as your miles were extended after you used it, my advice would be to wait and don’t touch the ticket at the moment. The redeposition of the miles might cause problems and you might need to deal with sales offices and multiple feedback forms to solve that.

Plus, if you decide to wait until an involuntary change, be aware that the call center would be unable to rebook you without detaching the ELPL voucher and the upgrade so most likely to save them you would need to contact a sales office so be prepared for that.