I am wondering something similar as the above poster. We are flying JFK-FRA in Sept (home from AMS on KLM). I have over 3 months but less than 6 months on my passport from our date of departure from AMS which is all that is required in either of those countries. However, SQ won't let me add my passport to my booking because it has less than 6 months validity. I do not want to risk being denied boarding so will probably try to renew my passport before we leave in 8 weeks. I don't like that it's come down to the wire like this! Anyone have any experience boarding with less than 6 months passport validity?