It looks like when you own the airport, the game doesnt check for paths to gates or even that you have a gate to use.
Ok, I can fix this very easily....
I had not thought of this condition.
1.42 posted to fix both of these...
Basically it does 4 checks when a plane enters the airspace of an airport...
1) It checks to see if the vehicle matches the station type. i.e. it is an airplane trying to land at an airport. If it passes it goes to step 2.
2) It checks to see if the station owner is OWNER_NONE. (This is for the oilrigs.) If this passes, it skips steps 3 & 4, and allows the landing.
3) It checks to see if the vehicle owner is the same as the station owner. If this passes it skips step 4 and allows the landing.
4) It checks to see if the vehicle owner has a terminal at the airport. If this passes it allows the landing.
I just need to remove step 3 from the checks...
After this initial check above, it then later checks to see which runway it is allowed to use.
And this is where it should have failed.
Because there would not be a terminal on any runway that would allow the landing at that runway.
Except Cargo terminals...
I am guessing that you re-assigned all the passenger terminals but did nothing with the cargo terminals.
At Indy, all 4 runways can land cargo planes.
So there is another bug...
A Passenger plane should not be checking against a cargo terminal for landing. And vice versa.
This one may take me a little while to fix.
But I will fix both and post an update.
Solution: use a seperate airport only company to build all airports, like company 14.
Well, I have structured everything to eventually have the possibility of Town owned airports.
I tried to implement it once before. Got everything working correctly except the link graphs...
I never could get them working correctly and eventually gave up on it.
Not sure I want to try again...
The other thing is...
If a town builds/owns the airport, then it will decide what to use for an airport, not the player.
I am not sure I like that idea...
But another idea it to get rid of the catchment and do "Entire Town Catchment"
This would remove the "2 airports per town" idea though.
And Noise would be changed to limit airport upgrades. Or maybe remove noise and use population.
So a small town would only allow small airports, as it grew, it would then allow medium airports, then finally large.
The exception would be Terminus airports. And the cost would keep them from being used everywhere.
Towns would lock on to the nearest airport and give all the people to it. Say within 50 tiles of town center or something.
I have been toying with this idea...
Would make use of the airport classifications.
But would probably need a few more airports in the small and medium classifications.
This would also fit in with the idea of town owned airports if I try again.