Hello- does anyone know how I can check in and choose a seat on the Iberia flight LGW-MAD when I book through BA? I have BA status which allows me to choose a seat but I can’t even check into this flight online, let alone choosing seats. It’s the second time this has happened in the last couple of weeks. I need to book the same flight again but am tired of this issue, keep getting stuck at the back of the plane because those are the only seats left by the time I check in at the airport.

Thanks!