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The airline caused international fury when passenger David Dao was filmed being dragged off an overbooked flight with blood gushing from his mouth.

And the company's name has been further damaged after an employee assaulted an elderly customer.

Shocking footage shows the grandad walk up to the United Airlines employee to speak with him.

After only a short conversation, the elderly gent begins to walk away.

But the United Airlines employee quickly turns and shoves the grandad to the floor.

(Image: KPRC)

The old man lies unconscious as terrified airport staff scramble to find somebody able to treat him.

Eventually an off-duty nurse rushes to help the man and screams: "Please God call 999."

Pensioner Ronald Tigner, 71, reportedly asked United Airlines employee Alejandro Anastasia for a new boarding pass before a brief argument broke out.

Tigner told the customer service representative to "wipe the smile off his face," according to local news outlet KPRC.

Anastasia was furious with the instruction and warned the grandad that he would "kick his ass" before pushing him.

United Airlines is now being sued for £785,000 after the incident which took place at Houston's Bush Intercontinental Airport in 2015.

The footage has been released as part of the lawsuit.

“This is just one of the most inhumane things I’ve ever seen in my life," Tigner's attorney William Hooke told KPRC.

“They literally left him there like a piece of garbage.

“We want people to come forward who’ve been treated just like Mr Tigner and like Dr Dao, any of the other people who’ve flown United and been treated this way, because this has to stop.”

(Image: KPRC)

Anastasia was later charged with causing injury to an elderly individual and was ordered to write a letter of apology, pay a fine and attend anger management classes.

United Airlines have apologised for the incident.

“We have seen the video from 2015 that shows completely unacceptable behaviour by a United employee," United Airlines told KPRC.

“This employee is no longer with our company. The conduct shown here does not reflect our values or our commitment to treat all of our customers with respect and dignity.

“We are taking a thorough look into what happened here and reaching out to our customer to profusely apologise for what occurred and to make this right.”