SouthEastFacts:

Do you have comprehension problem. Op clearly explained that it is only during emergencies that fuels are dumped and dumping fuels leave a white trail. He is correct, even though this is rare.

You don't land a plane that has exceeded it's maximum landing weight.

There are other reasons planes dump fuel. Op just explained one situation.

Thanks. Over sabi no go kill people for here.

If anyone have a counter claim they should create a thread, simple!

dadalicious:
Ignorance is really a disease.
When I was younger, anytime I see that whitish clouds from an airplane, I always thought it was a jet moving very fast.
Thanks bro for enlightenment

You're actually right and OP is wrong.

Those are called contrails and does not have anything to do with dumping fuel.

con·trail
/ˈkäntrāl/Submit
nounNORTH AMERICAN
a trail of condensed water from an aircraft or rocket at high altitude, seen as a white streak against the sky.

Almost everything the OP said wrong. Your explanation about the clouds behind the plane is correct. If you go to Europe where the air is cleaner and less dense, you will see more of the contrails.

Now to the subject matter, aircraft's dump fuel because of emergency. If a plane is going to have an emergency landing that may result to a fire, like the landing gear are not activating, then fuel is dumped so that the chances/ scale of fire outbreak is reduced. Chei.

Hotfreeze:
White clouds behind airplanes aren't fuel, don't let the OP mislead you.

Those white streaks planes leave behind are actually artificial clouds. They're called contrails, which is a shortened version of the phrase “condensation trail." Airplane engines produce exhaust, just like car engines do. As hot exhaust gases escape from a plane, the water vapor in the fumes hits the air.

TechCapon, stick to your tech blogging about chargers and earpieces and stop misleading people. You think pilots dump fuel indiscriminately? Nigger thinks aviation fuel is tap water.