What was supposed to be a routine flight from Salt Lake City to Amsterdam turned into a terrifying ordeal for passengers aboard Delta Air Lines Flight DL56. The Airbus A330-900, carrying 288 people, suddenly plunged around 1,000 feet over Minnesota due to unexpected severe turbulence. At least 25 passengers were injured, prompting an emergency landing at Minneapolis–Saint Paul International Airport. Medical personnel met the aircraft upon arrival, and several passengers were rushed to hospitals. Experts say clear air turbulence — invisible and impossible to detect — may be on the rise due to climate change. Here's everything we know about the mid-air chaos.