The shortest map line is rarely the exact route
Airways, restricted airspace, traffic flow, winds and air-traffic-control constraints shape the path. A slightly longer route can be faster if it benefits from stronger tailwinds or avoids congestion.
Weather is considered along the whole journey
Planners examine departure conditions, en-route hazards and forecasts at the destination and alternates. Thunderstorms, icing, strong winds and volcanic ash can all influence routing decisions.
Fuel planning includes more than trip fuel
Aircraft carry fuel for taxi, the planned flight and required reserves, with additional amounts for contingencies or alternates as rules and conditions require. More fuel adds weight, so unnecessary excess also has a cost.
Alternate airports provide a backup plan
If the destination weather or other factors require it, the flight plan identifies another suitable airport with enough fuel to reach it after an unsuccessful approach or diversion decision.
Aircraft performance can change the plan
Runway length, temperature, elevation and expected landing weight can affect whether a particular airport is suitable. Payload may need adjustment in demanding conditions.
Planning continues after departure
Pilots receive updated weather and air-traffic information in flight. A route, altitude or destination can change when reality differs from the original forecast.
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