Thanks L,
If A is point of Departure and B is our destination; C is destination alternate and D is planned enroute alternate.
I understand that PNR will be at the mid point in ur course to B ( if flying from A to B ) in terms of ur cruise fuel and that u will still have ur reserve fuel incase u decide to come back to point of departure A.
In Critical Point, for example if I am flying from A to B with planned destination alternate C, is it the point before/at which
a) i cannot return to A ( sounds like PNR, But i am not sure )
b) cannot continue to B due to weather/fuel constraints
C) preplanned point, X, at which I have to decide to either go to B or an enroute alternate D and, if this (c) is the answer then, how do I preplan this point.
I hope I am clear..
Thanks for your help.