aircraft

Flight 2494 was preparing for departure to Indianapolis when "a bullet apparently struck the right side of the aircraft under the flight deck", a Southwest spokesperson told the BBC's US partner, CBS News.

The incident- known as a quick reaction alert - is not uncommon and involves RAF crews shadowing Russian military aircraft near UK airspace.

However, faced with the massive cost of getting such novel aircraft approved by regulators and then building up manufacturing capabilities, some investors are bailing out.

The pilot and passenger of the Cessna aircraft, owned by First Take Aviation LLC, were able to exit safely after the crash before firefighters arrived.

Tweaking the flight paths of a handful of aircraft could reduce contrail warming by more than half by 2040, at a cost of less than £4 per flight.