Eu não tenho ideia nem conexão com a indústria da aviação, então eu pesquisei. Eu encontrei
Block Fuel / Ramp Fuel / Total Fuel On Board
Block fuel is the total fuel required for the flight and is the sum of the Taxi fuel, the Trip fuel, the Contingency fuel, the Alternate fuel, the Final Reserve fuel, the Additional fuel and any Extra fuel carried. Source: Skybrary.aero.
Isso, por sua vez, levou-me a pesquisar "bloco de aviação" e descobri
Perhaps you’ve noticed that flights flown on different airlines between the same airports take different amounts of time. You might reasonably ask: why would different flights, departing from and arriving to the same airport take different amounts of time? The total amount of time a flight takes — from pushing back from the departure gate (“off-blocks”), to arriving at the destination gate (“on-blocks”) — is called “block time”, and airline block times vary for the same routes. Source: FlightStats.
Eu acho que a queima de bloco é a quantidade de combustível queimado entre o portão de embarque e o portão de destino.
My second question is how is it calculated?
Comece combustível - combustível final, eu acho. Isso pode ser então tabulado e usado para futuros cálculos de queima de blocos de vôo.
I have also heard it depends on seasonal data.
Muitos fatores operacionais variam de acordo com a estação, então isso parece razoável.