I actually expected to see a map of insides of the airport: check-in stalls, security control, lounges and shops. Some places even had those, but it is painted over with an orange "this is an airport building" matte plate.
I checked original OSM and it seems to me that most airports there are more or less mapped. I checked Belgrade, Sofia, Vienna and Nurnberg. Every one has icons for security check, car rentals, gift shops and so on.
