okay i tried two things:
on the 6th I stood on the runway for almost 20 hours. than flew that one mission. i received ~507tsd Cr.
on the 7th I was in the air almost all day long. flying missions in slow motion, doing some landing… passive income: 1.298tsd Cr.
now i will try a long mission and setting the sim rate to minimum. but there is one thing i noticed: i think the autopilot is messing up and is increaasing height constantly. we will see about that.