Adam had to reserve his flight to Spain over the phone with American Airlines because he was using credit on his account. That wouldn’t be a problem, except for how the airline told im that he wouldn’t be allowed to choose his seat, because the flight was actually on Iberia Airlines, and he was making the booking via codeshare. And yet, in 2012, the two airlines’ computers won’t talk to each other, and he can’t pick his seat even though he’s paying a pile of money to make this reservation. Update: A reader wrote in to point out that Iberia actually doesn’t let passengers in coach pick their seats until 24 hours before their flights. If Adam’s flight is actually business class or fancier, he can call up Iberia to choose his seat.