United Flight 1681 left Las Vegas for Newark on Oct. 24. It turned back soon after takeoff.
A flight attendant saw a passenger texting about a hijack. She alerted the captain at once.
The crew locked the cockpit. The passenger did not know the plane was turning back.
The plane was full of fuel for a cross-country trip. The crew burned fuel before landing.
The plane landed back in Las Vegas at about 11:05 pm. No one was hurt.
All 150 passengers and 6 crew members landed safe. Police met the plane at the airport.
Police arrested a 25-year-old man at the airport. He was charged over a terror threat.
The man posted $10,000 bail and was released. He is due in court on Oct. 27.
The crew had reached its work-time limit. The flight left again on Sunday morning.
United said the flight returned to address a potential security concern.
The FAA said it will investigate the incident. No timeline has been shared yet.
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