Originally Posted by
millikins88
I booked directly with KLM and have spoken to both KLM and Delta over the phone and neither were able to give me an answer.
ok , so one option left = KL sales office at ARN
I tried to make a simulation but it doesnt work = "Unfortunately, it is not possible to buy additional baggage online for this flight, as it is operated by another airline. Please do so during online check-in"
When booking a AMS-SEA from DL , i get a quote for €60.00 , so you can , at least , expect something around or over this price