A Southwest Airlines flight dropped to just 525 feet above the ground on Wednesday. The incident prompted an altitude warning and an FAA investigation. A Southwest flight dropped dangerously low off the coast of Hawaii in April. Insider Today Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Bull Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. Email address By clicking “Sign Up”, you acc ...