Haha, last year I had my company TA book my ticket, a simple round-trip from EWR to BAH. The flight out was EWR-IAD-KWI-BAH. I thought the return was the same... but it was ACTUALLY BAH-KWI-IAD/DCA-EWR. They only checked my bag through to IAD in BAH, saying that they couldn't check it all the way through because the BAH-IAD was United and the other portion was Continental (pre-merger of course). I argued at first, but gave up after awhile.

Didn't realize till I got to IAD, where I futzed around for a bit before going to an agent and trying to drop my bag and collect my boarding pass to EWR. When I found out, I made a dash to the taxi stand, and there was a single taxi there waiting. I jump in and belt out "Take me to Reagan airport!" He is confused... I tell him, the OTHER airport here in DC. Well it turns out it is his second day on the job, he is from Afghanistan, and he has no knowledge of DC or DCA airport! Google Maps to the rescue, I use it to direct him to the airport and make it in time to check-in for my DCA-EWR flight.

The same thing happened before when I flew the ex-GF down to IAH to visit me... Turns out her return flight was actually out of HOU and not IAH. I u-turned it real quick when exiting the airport, picked her back up, and made a mad dash down highway 45 and got her there just in time - thankfully it was 6am in the morning, otherwise she would have never made it with the traffic in Houston.

Lesson learned Always double-check your itinerary for airport codes, especially when it is a travel agent or website making your booking for you!