Originally Posted by
flyerCO
Their reply makes no sense. If a ticket existed, all that would've been needed was to enter it in the KLM system. KL/AF self checkin machines even let you add the ticket number if it's missing. There would be no issue missing flight as it takes seconds to enter it. This just isn't believable on the part of DL.
Based on what was described, the most like speculation is KL did a schedule change (flight number) at some point, Expedia failed to revalidate/reissue. The prior ticket wouldn’t have been valid on the new flight number.