With FltPlan's runway analysis program, in partnership with Aircraft Performance Group (APG), you have the ability to depart at heavier gross weights than other take-off performance programs allow using traditional climb gradient information only.
Final reserve fuel is the minimum fuel required to fly for 30 minutes at 1,500 feet above the alternate aerodrome or, if an alternate is not required, at the destination aerodrome at holding speed in ISA conditions. Some Regulating Authorities require sufficient fuel to hold for 45 minutes.