I just had the following happen to me:
I accessed a schedule of an aircraft that was 100% green and activated for several days now and the plane had been flying this schedule.
Intention: To move around one of the flights, flight "Y"
I moved around Flight "Y" and saved it.
Doing so, the system refreshed/saved the schedule, and after this the following happened:
Now all of a sudden, a different flight "X", scheduled to depart at 3:40 am HT, appeared in red. When I clicked on "Set Planner to this flight number" to see what was going on, this flight had no slots available!
But this flight had been already flying for several days, and has also been scheduled in upcoming fights for the upcoming 3 days in the "Flights List"!
I basically all of a sudden just lost a slot!!!
What did just happen, why did it happen, and how to prevent happening this in the future?