Not all planes are capable of dumping fuel. Boeing's 747 and 777 both have the ability to jettison kerosine, as has the Airbus A380 and an A330. However, regional jets such as a Boeing 737 and Airbus A320 can not.
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Since most twin jet airliners can meet these requirements, most aircraft of this type such as the Boeing 737 (all models), the DC-9/MD80/Boeing 717, the A320 family and various regional jet (RJ) aircraft do not have fuel dump systems installed.
In most cases, airlines only dump air in midair immediately before landing. They don't do it before or during takeoff, nor do they do it halfway through their flight. Rather, airlines may dump some of their airplane's excess fuel immediately before landing so that it lowers the weight of their aircraft.
Turbulence isn't any milder on the A330. It's just different. Because I know there's at least one of you who wanted to see how much larger the A330 toilet is compared to the 777. Basically, if you have to use the lavatory in rough air, it'll be less messy on the A330!
The A330 is one of the most reliable airliners in the world, with an impressive safety record. Thanks to the use of advanced materials and design, the aircraft is able to withstand the rigours of commercial flight.
However, if a pilot has initially conduct an A330 course, in order to fly the A350 would need to conduct a A330 to A350 Differences Training. Note: The A330 is a common Type Rating with the A350. Therefore, when a pilot gets qualified on either aircraft, the endorsement on his/her licence is A330/350.
However, the new Upper Class seats on the A330-900 and A350 are simply fantastic and hands down my favorite way to cross the Atlantic. You can easily see which plane is flying your route by clicking the “Details” button when you search for flights on the Virgin Atlantic website.