Groaningly titled SPUDS (Synthetic Personnel Using Dielectric Substitution), the tubers apparently replicate how airborne signals are bounced and absorbed by real-life passengers, but without the need for Boeing to offer complimentary snacks or tiny drinks during testing.

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The coach passed through at least two security checkpoints without a problem, but at a third checkpoint in Querobabi the passengers were ordered off the bus during the search.

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Longer planes could be a good way of netting more passengers without having to add capacity, according to Petercam analyst Thijs Berkelder, but he said that demand would have to be there to make up for it.

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But the ultimate goal is to create a world where self-aware vehicles can drive passengers around without hitting pedestrians or bumping into other vehicles.

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But most business-class beds aren't wide enough for deep sleep because passengers can't change positions without waking up.

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