Mr. Musk, whose company SpaceX owns Starlink, has attacked the top executive of Delta Air Lines for not selecting the internet provider.

The online retailer said it would “pause” its relationship with 21 Air, the cargo airline operating a Boeing 767 that overshot a runway in Miami.

Aviation start-ups and the Trump administration want to replace helicopters with electric aircraft, but the new vehicles still have to pass arduous tests before the public can use them.