Hi,

I don't understand why the 737 classic is the only CS plane which is "playing" with P3D flight planner and ATC.
With any other plane when I start a flight, I'm loading a P3D IFR flight plan and then getting a ATC service without any issue.
With the 737 classic, as soon as I'm changing something in the FMC, the P3D FLP is disabled (still in P3D flight planner but not active in ATC window). During cruise, I often loose ATC contact and have to establish the contact again.

Any idea of what is the cause of this behaviour? Why I don't have this with other CS planes (757,767, 732)?