It was only a short flight. Unfortunately, I was in the one row with no window (???). Luckily, I was seated next to a nice guy who was happy to talk. He was English, also going to Salamanca to study Spanish.
The airport in Madrid is very big, with lots of halls and corridors and escalators and travelators. Luckily, everything was clearly signposted, or we probably would have gotten hopelessly lost.