Here’s some resources controllers use to determine if an aircraft is too large for the airport:
- Aircraft Information Sheet
- Aircraft Runway Size Restrictions
- LiveFlight Airport Chart
- Airport Diagram
- FlightAware
- ifatc.org
Then you can spawn in different sized aircraft and taxi around to see if the different aircraft meet the taxiway requirements for the airport.
After gathering all the required information from all available resources, you then can be assured that you know the requirements for that airport.