In true not really understand but posting anyway I used Google and seems a 747 uses 10% of its fuel for take off. Obviously depends if it’s flying for 1h or 12hrs as to how many % it is. Much like a car.It's the major use of power. Take aircraft, some can use up to 50% of their fuel payload on take-off alone. Cruising is incredibly efficient, changes in speed are not.
Seems like London to hong kong only 4% is used for take off. Where did you get this 50% from?
Back to a car the % used to get to 70 will be higher on a drag strip quarter mile than a 200 mile motorway trip …
Not really sure why you have gone down this route tbh
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