What is minimum fuel requirement for airliners?

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The question of today is: "What is minimum fuel requirement for airliners?"
When you are planning a flight, you are facing a challenge: If you fill the fuel tanks to the brim, you cannot load the cabin full of passengers, or the cargo compartment full of cargo. Otherwise, the airplane will be too heavy. Therefore, the fuel load is carefully calculated.
Fuel consumption depends on cruise altitude, which in turn depends on atmospheric temperature and the mass of the airplane, or the weight.
The higher you fly, the less fuel the engines burn per hour. Therefore, if you add too much fuel, your cruise level will be less than optimum, and as a result, you will burn more fuel.
In this video, I explain EU regulation 965/2012 CAT.OP.MPA.150 "Fuel policy".
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