HELP! I am ending up with a negative airline balance after a few "weeks" of operating. This has happened every time I create an airline. Everything seems to be going great, until I buy my 5th plane, then things are normal for a few "days", then the balance suddenly drops to a large negative value (record -44 million) and continues to decline. Is there something I am doing wrong? Or is this some sort of glitch? I seem to keep ending up like this on all my airlines so far.