Originally Posted by
Guy Betsy
No. Bags will be tagged only to where ticket is shown, ie IST. You may only tag it to FRA if you have say, a few hours in between so that you may say that you need to take something out for fiend you're meeting in FRA. You would thn have to clear immigration , collect your bags and clear customs before proceeding to checking for your other flight...
OP has to clear immigration at the Schengen port FRA anyway.
I would pay the "high change" fee and save the miles for the FRA-VIE flight by re-issuing it to VIE.
If none of this works, I'd try to book the second award IST-VIE.
And only if that is not an option, I'd attempt to short-check the bags to FRA.
If that fails, you could report ill or unfit to fly in FRA and have the bags pulled for you (that takes a while, say 90 minutes) ... then check them again. But it is seriously not worth doing if it can be avoided by paying a change fee.