I have been playing a save game for many days without any issue but this evening all of a sudden flights are no longer arriving at my airport even though they are scheduled. I have tried exiting the game and coming back in which some aircraft land I then get warning about delaying the flight but before I can do anything they start taking off without any passengers and then no other plans land.
Sometimes when I load the game staff stop doing anything and at security even though staff are manning the checkpoint it says it’s unmanned. If I destroy the checkpoint the staff stay in place.
Please find my save game: