Mr Piccard's Solar Impulse has a wingspan of just over 63 metres, similar to that of a giant Airbus A340 airliner, but its carbon-fibre fuselage has only enough room for one pilot.

ECONOMIST: Electric planes

So, although it has a wingspan of 61 metres, HB-SIA has room only for a pilot.

ECONOMIST: Solar-powered manned flight

Think fearless fighter pilot in the cockpit versus a man at home in a conference room with spreadsheets.

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For the flyer with too much spare room in their carry-on, we propose the Cup Pilot.

ECONOMIST: Business travel