Is it possible to amend or create a new flight
Plan whilst in the sim?
I am finding you have to exit back out to the main menu, in order to carry out a second sector
You can load saved flight flans whilst in-game, so maybe have a bunch of flight plans ready? I know that’s not ideal, but over time you will start stacking them up. I’m new to this kind of flying, so I hope this is helpful in some way!
Yeh its a good suggestion 
I just liked staying in the sim in order to carry out as real real as possible aircraft turnarounds Without having to come out of it and remember the time, weather and gate you was on