Table 2: Optimized variables cruising pressure altitude pcruise and speed correction factor α with corresponding results of the time of flight and fuel burn for different objectives of optimization.

Objective

Parameter

MD-11F

B777F

Min. time

pcruise

210 hPa

220 hPa

α

1.12

1.10

Time of flight

19461s

19667s

Fuel burn

44852 kg

44715 kg

Min. fuel burn

pcruise

220 hPa

240 hPa

α

0.94

1.01

Time of flight

19537s

20403s

Fuel burn

44816 kg

41151 kg