Heathrow Airport has confirmed one of two airport workers injured in a crash on the airfield this morning has died.
One passenger who had been on a Zurich-bound flight, said: "We boarded and waited and then the captain gave a series of apologies and further delay announcements".
Both men had to be freed from the wreckage of the two vehicles by firefighters.
A man has died in the incident at Heathrow Airport.
Police and the ambulance service said they were called just after 6 a.m.to a crash on the taxiway. We await formal identification.
Another man is believed to have broken his shoulder, though his injuries are neither life-threatening nor life-changing.
Some passengers had to disembark from a plane due to the incident, a spokeswoman for the airport said.
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Despite "extensive efforts to resuscitate him" at the scene and on the way to a west London hospital, he was later pronounced dead.
A spokesperson for Heathrow said: 'Following an incident on the airfield involving two members of staff, an investigation is underway and we are working with the Police.
"There have been no arrests and the Health and Safety executive has been informed".
The majority of the flights delayed this morning were from Terminal 5.
She added: "Our deepest condolences go to the family and friends affected by this accident".
A BA spokeswoman said: "We are deeply saddened by this tragic incident and are offering our full care and support to his family and colleagues. The airfield remains open and we will work to minimise disruption to our passengers" journeys'.
"Officers have informed next of kin".