100% agree with this thread.
One way to limit aircraft from using inappropriate airports would be to allow for maximum weight bearing capacity on runways (which is often published in real life).
For instance, this runway is rated for single-wheel aircraft up to 30,000 lbs.
Here’s a more complex one. This includes PCN data underlined in blue.
Here’s a list of the type of gear, might also need to be a flag in the aircraft config:
This is valid for US airports, but you could also use PCN classification, which meets ICAO standards.
You could also do something like set “career mode” flags for parking spots based on mission type as well as aircraft size. This would shunt appropriate aircraft to the correct locations on the airport, as well as prevent overly large aircraft from being available at, say, a small airport. Or limiting airplanes that exceed a certain passenger capacity (there’s often a threshold when capacity exceeds 19 seats).
Currently, no such coding exists in the airport or aircraft configs. Just spitballing some creative ways we could expand what’s available, using available data, without over-allowing aircraft.