Pilots of American Airlines flight 199 were forced to make an emergency landing after the windshield shattered. The JFK-bound plane landed at Heathrow Airport, where a cabin crew member captured the extent of the damage to the Boeing 767-300 and uploaded a photograph to Twitter. A spokesperson for the airline confirmed that a maintenance issue caused the diversion after take-off from Milan but say the aircraft is being investigated to determine the cause. The Boeing 767-300 departed from Milan-Malpensa Airport at 10am and was scheduled to arrive in John F. Kennedy International Airport at 1.20pm local time. The plane instead landed shortly after take-off at Heathrow at 11.18am. Twitter user @JackHudock, who uploaded the picture, said: 'I was on the flight. Textbook emergency landing. I was working crew. Not pilot though.' American Airlines confirmed 183 passengers were on board, along with 12 crew.