Hey I've been playing this game for about 3 years and for the first time the calendar icon on the 'Fleet management' screen is showing red for a new plane I just leased and scheduled for. I can't for the life of me work out why - the maintenance ratio is good, the flights are all within the time window etc. Sorry to be dumb, but any ideas?
Go back to scheduling and check the flight. I've sometimes assigned the flight thinking that everything had a green tick and on one or to days their were no slots available.
Hope this helps!