My aircraft now has -6 hours, meaning it was on a 30h day

So I thought I'd change some 1 frequency routes to 0,5 to decrease the excess time.
But when I choose view aircraft, and then view route, and then choose edit route it says:
"You either selected no aircraft, or selected an invalid aircraft. Please go back and try again."
Same thing with View route->edit
And yes, I know there will be a reset, I'm just testing stuff. At Uni my fellow students usually gave me their projects, no one had the skill of crashing progs like I did
