I think the person above you is mistaken. The A380 is a quadjet. It is certified under FAR (Federal Aviation Regulations, USA) part 25 and JAR (Joint Aviation Regulations, Europe) part 25.
One of the requirements of FAR/JAR 25 is that the directional control can be maintained when two critical engines (that means under the same wing) fail.
Yeah, the idea is over 25 years old here in Europe and is called "betting exchange". Their only innovation is getting it regulated as commodity trading rather than online gambling.
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