That is correct. I have created my own mission and was able to add it successfully to the bushtrip.
However, when I exit my mission (AirlinersEnv) in the middle it does not get saved. When I revisit my mission it starts from the beginning. The difference between my mission and the other bush trip missions is that I don’t use any legs. But I’m not sure this is the reason.
I looked into the .Flt files to find any hints with no success.
Maybe I missed something. I just noticed that the landing challenges can’t be saved either.
Here is a screenshot of my mission in the bush trip.
There is a little bit more about my mission here: