As a BAEC Silver, should I be able to pick a seat on Iberia Express?
I've booked a flight to Seville, which means a BA or Iberia plane to Madrid, changing onto Iberia Express for the leg down to Seville / back. My booking is on a 125- ticket. As a BAEC Silver, I've been able to pick sets for the BA and Iberia planes between London and Madrid. However, for the Iberia Express operated flight between Madrid and Seville, it's saying "Seat choices are available at check-in" and not letting me pick one
Is this a case of needing to use a different website other than BA Manage My Booking to pick seats, or a need to phone up someone, or am I really unable to select a seat until checkin?