Trip fuel covers the planned route
This is the predicted amount needed from takeoff to landing under the expected winds, altitude and aircraft performance. It changes from day to day even on the same city pair.
Taxi fuel accounts for ground movement
Engines and auxiliary systems consume fuel before takeoff. Busy airports with long taxi times may require more than a small uncongested field.
Contingency fuel protects against variation
Actual winds, routing and traffic can differ from the plan. Regulations define minimum structures, and operators may add margins based on experience and current conditions.
Alternate fuel may be required
If planning rules call for an alternate airport, the aircraft must be able to reach it after an unsuccessful attempt at the destination, with the relevant reserves still protected.
Captains can request additional fuel
Weather uncertainty, congestion or limited diversion options may justify extra fuel beyond the basic dispatch plan. The decision balances flexibility against the penalty of carrying additional weight.
Tank capacity is not the normal target
Filling the tanks for a short flight would often be wasteful and could even create landing-weight issues. The objective is an appropriate, compliant fuel load for the specific mission.
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