The Learjet 75, a slightly larger version of the Learjet 55, also serves as an air ambulance: The type has found a unique second purpose. Graphic videos in the social media embeds below Security ...

PHILADELPHIA — A key piece of hardware that aviation experts and pilots said could solve the mystery in the fatal crash of the medical transport Learjet on Jan. 31 turned out to be useless.

The study assessed potential damage a drone impact could cause to critical flight surfaces on aircraft such as a Boeing 737 and Learjet 30/40/50.