Prince Albert II of Monaco, left, and Swiss adventurer Raphael Domjan, right, on board of a "Pipistrel Velis Electro" light two-seater single-engine electric aircraft, before piloting it on a flight from Payerne to Colombier and after a visit of the SolarStratos mission outside the hangar at the airbase in Payerne, Switzerland, Monday, Sept. 4, 2023. The main objective of the SolarStratos Mission project is to be the first solar flight to achieve stratospheric flight. (Laurent Gillieron/Keystone

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