I apologize for being naïve, but on our trip departing US - IST via AMS I cannot find a location to enter our passport info. on UAL's My Trips. Its been a while since I have flown to Europe and forgot if they just check it when we check our bags. I was able to enter the information on the Lufthansa flight leaving Athens to USA via MUC, but for Turkish (AMS to IST) I keep getting an error code with the Turkish Confirmation number.
Thanks.