The computer flight plan supplies a C.P for two engine high level cruise. Low level return to adequate airport, in the critical fuel summaries. However this CP is based on using the minimum required fuel load for the flight. Increase the fuel load, which is the norm, and the C.P or in the case of a return to the departure airport, the PNR, and the PNR will now be further away from departure. Anyone have a simple formula for calculating this new PNR. Aircraft twin engine jet 737 / A320. Wind zones could be averaged for calculations.
Cheers Mang.