The trend towards more twin-engined aircraft drives up the cost of engine development, by boosting the need for power and reliability.
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The crew were flying their twin-engined aircraft on a night-time cross country navigation exercise out of RAF Kinloss in Moray on 13 April.
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However, multi-engined aircraft - like the one that crashed - can be provided with ATC clearance to fly elsewhere in the London Control Zone.
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This year, Boeing came roaring back, expecting to finish with firm orders for around 1, 000 re-engined 737 MAX aircraft.
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The A380 is a four-engined, twin-decked, wide-body jet aircraft built at Airbus's factories throughout Europe and assembled at its facility in Toulouse, France.
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