A JetBlue plane was sent careering wildly through the skies for fours after a mechanical meltdown.
The 155 people on board the Las Vegas to New York flight were left terrified as the A320 aircraft lurched from side to side and went into steep turns after its hydraulic system failed.
Travis McGhie, a passenger on the Sunday afternoon flight, said: 'It was four hours of hell.'
Another passenger, Tom Mizer, told the New York Post: 'People were getting sick. Some people were throwing up. There were a lot of people getting nauseous.'
They said that crew members of Flight 194 'did everything they could to prevent panic', with one attendant walking down the aisles trying to reassure people.
Mr Mizer said: 'She said "Look at me, I'm smiling. If I was scared, you would know it. If I'm not scared, you don't need to be."'
Mr McGhie added that there was no screaming, but 'there were definitely people reacting out loud'.
He said: 'The plane kind of felt out of control. It wasn't able to balance itself, and the air was choppy.'
The pair, both from Brooklyn, said they realized something was wrong with the aircraft as soon as they took off from Las Vegas airport.
Mr Mizer said: 'You could hear a screeching - an obvious mechanical screeching. We were bouncing around a lot.
'People on board got a little freaked. People were upset.
'Nobody was crazy, but everyone was upset. It became a long, sort of very tense waiting game.'
A pilot soon declared an emergency and radioed air traffic controllers to tell them that they had lost two hydraulic systems.
But as the plane contained five hours' worth of fuel, and the A320 cannot dump the excess, the pilots had to circle the area until they had burned enough to land safely.
The plane landed at Las Vegas' McCarran Airport at 7.37pm where the flight had taken off.
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