A year after Boeing Co. slogged through a deep executive shakeup and prolonged existential crisis, the US planemaker just landed its biggest-ever aircraft order, propelled by a powerful endorsement from President Donald Trump.

Donald Trump is the most powerful and famous person on the planet, at the helm of the biggest economy and the strongest military.

Concerns have been raised about the potential cost to taxpayers for refitting the aircraft and the ethical implications of accepting such a gift.