Here's one for you, the other day I was scheduled for our shortest sector, 33 minutes block, the flying pilot loaded the CFP, when he called for taxi he called using the return flight plan call sign (no bells went off at this point), fifteen minutes later the ATC asked us what our routing was
, well needless to say, the FO had loaded the flight plan using the return routing which was different, ATC let me have it (ouch), but didn't report it
, this flight was so short that I never even considered double checking the box, both of us had flown this flight on numurous occasion. I really wanted to let my partner have it but it was MY responsibility to check the box, which is SOP, doh!
, very embarrassing and luckily no traffic conflict. Lesson learned.