Max claims this is proof of chemtrailing during the search for MH370. It is taken from a BBC news article here
Max claims that this is flight JA500A, which is the aircraft shown at the beginning of the piece and is a Gulfstream of the Japanese Coastguard http://aegwaspotters.blogspot.co.uk/2014/03/japan-coast-guard-gulfstream-g550.html
The uniforms are Australian in the piece and the aircraft shown at the end is an AP3C-Orion as this article clearly states
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So all in all a fuel dump.
Aircraft have two major types of weight limits: the maximum takeoff weight and the maximum structural landing weight, with the maximum structural landing weight almost always being the lower of the two. This allows an aircraft on a normal, routine flight to take off at the higher weight, consume fuel en route, and arrive at a lower weight. There are other variables involving takeoff and landing weights, but they are omitted from this article for the sake of simplicity.
It is the abnormal, non-routine flight where landing weight can be an problem. If a flight takes off at the maximum takeoff weight and then faces a situation where it must return to the departure airport (due to certain mechanical problems, or a passenger medical problems), there will not be time to consume the fuel meant for getting to the original destination, and the aircraft may exceed the maximum landing weight to land at the departure point. If an aircraft lands at more than its maximum allowable weight it might suffer structural damage, or even break apart on landing. At the very least, an overweight landing would require a thorough inspection for damage.
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