Thanks for your work especially on this day as the free world lost the USA.

Big hydrogen bombs :

… a study from 1963 suggested that, if detonated 28 miles (45 kilometers) above the surface of the Earth, a 10,000-megaton weapon could set fires over an area 500 miles (800 kilometers) in diameter.

it took me so much time searching how these birds would make construction work before finally catching on the double meaning of Flyers !