Or the fact said passanger checked their passport at one gate then got in line to board my flight, and the person's seat number happened to be the seat number of the only misconnect on a full flight. Mistakes like that are kind of like plane crashes, it takes a perfect storm of a ton of little things adding up to one huge fudgefest. This passanger flies 100+ segments or 100,000+ miles a year on the Star Alliance, too.
I don't get it. "Todays flight to Eugene will be about 1 hour and 10 minutes once we're airborne". I know it was my fault in the end, but seriously I had one chance in a mad rush of boarding an oversold flight on a quickturn with the gatereader out to notice the boarding pass said "Calgary", the passanger had way more chances to catch on than that.