Fuel calculation

Because of the large number of questions about the method of calculating fuel of the flights,
 I liked to share you this special educational calculates fuel lecture.

We can divide the fuel used for your flight into four sections, namely:
1 - Taxi Fuel (fuel used for taxi)
2 - Trip Fuel (fuel used for the flight on air).
3 - Reserves (fuel reserve).
4 - Extra (excess fuel).

* - Taxi fuel:
                   it is calculated fuel for the needs of the aircraft operating system, APU and taxiing to the runway. For example, Beoing737 fuel used for taxi operation is usually from 250 to 270 kg (taxi fuel information supplied by the Department of Operations)

* -  Trip Fuel:
                   it is the fuel using in your flight, starting with take-off, SID, Climbing, Cruising, Descending, approaching, star and landing. (We will explain later)