the British Airways airplane had to fly back to London Gatwick following the incident, where it landed safely.
Most probably the door wasn't shut properly by the ground staff before departure.
The door fall just 20 yards from the couple walking near the airport.
I was on a plane a couple of months ago that aborted take off due to a door that wasn't closed properly.... have to say that's a pretty interesting experience too, the whole plane just went dead quiet - noone was talking!
Typical BA. Their trolley dollies think they're a cut above the rest and they can't even close a door properly!!!!