Believe it or not, an airplane's wings often contain a majority of the fuel the aircraft will use. Some planes also possess fuel tanks inside the aircraft's body; however, there are several benefits to placing fuel in the wings of an airplane.
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While fuel dumps don't happen every day, they're also not uncommon. Nor do they usually represent a major emergency. In fact if an aircraft is taking the time to dump fuel before landing, that's likely an indication that the issue forcing the plane to land is serious but not critical.
It would seem strange that pilots would purposefully dump fuel from their aircraft at a time when fuel prices have skyrocketed. What's more bizarre is that they do it in the air while flying. Tossing fuel into the air is a safe procedure for a good reason. Additionally, it is not as wasteful as it seems.
Over a certain altitude it is always considered safe to dump fuel. The high speed of the airplane means the fuel is spread very thin and will evaporate before it hits the ground. Accidents do of course happen where it is not possible to safely dump fuel and they end up dumping over populated areas.
As the airplane's engines release exhaust gases, moisture vapor is released as well.The cold temperature and low air pressure at high altitudes forces this moisture to condense, which creates the characteristic white smoke trail for which airplanes have become widely known.
The maximum landing weight (MLW) is the maximum aircraft gross weight due to design or operational limitations at which an aircraft is permitted to land. The MLW is set in order to ensure safe landings; if an aircraft weighs too heavy during touchdown, it may suffer structural damage or even break apart upon landing.
Typically in the case of an emergency landing, the plane will be landing somewhere well short of its destination. If it has not been flying long enough to burn off enough fuel to get below the maximum landing weight, they need to dump fuel in order to land safely.
In almost every case, any commercial plane flying is technically able to land even at close to its maximum takeoff weight. It will, however, likely put excess strain on the landing gear and other structures, so it's best avoided unless there's simply no other option.
The cost per gallon of fuel in September 2022 ($3.49) was up 2 cents (0.6%) from August 2022 ($3.47) and up $1.53 (78.1%) from September 2019. Total September 2022 fuel expenditure ($4.89B) was down 6.3% from August 2022 ($5.22B) and up 69.2% from pre-pandemic September 2019.
If you just want something simple, just look up the average fuel consumption for the aircraft type (in gallons per hour), and multiply that by the duration of the flight. Although airlines have more sophisticated tools to plan refuelling, this is how GA pilots estimate how much fuel there should be in the tank.
Fatigue is particularly prevalent among pilots because of unpredictable work hours, long duty periods, circadian disruption, and insufficient sleep. These factors can occur together to produce a combination of sleep deprivation, circadian rhythm effects, and 'time-on task' fatigue.