The Omission Of Saving a FSPassengers Flight

[silo]

I've never actually tried this out, hence the question: what about your flight plan? If you do not respond to ATC, after a while you get
it cancelled..

Try this (shh..don' tell anybody):
After reaching cruise level, wait for FS to hand you over to the next controller. Answer back "contact XXX center 121.1". Then switch to the
new controller only, but don't contact them. You'll never be bothered again until you decide you need them once more. I usually open the
ATC window about 300NM out from the destination airport and contact them again. When they answer, they'll give you ackward headings
to turn to. Don't answer and stay on your course. After 4 or 5 times the ATC is gonna give you the correct heading and tell you to proceed
on course. You are back with ATC...