Originally Posted by Chris26WI
I strongly doubt they will sell you a one way upgrade from D to C especially after ticketing.
And even if I do (my guess was that in BKK where I am spending some time with my GF it would be possible bye walking into the CI-office) I'll only have 40.000 miles
after my BKK-AMS flight anyway... yiha I'll be stuck on new signature aircraft in D

Anyway, I will survive... and thanks a lot for your input Chris!
(PS: we only paid 1.300 euro's each with a 1st class trainticket from any Belgian railwaystation to AMS and back included)