He wrote a message, the flight attendant noticed it. The plane had to turn back.

A United Airlines Boeing 737, carrying 150 passengers and six crew members, returned to Las Vegas shortly after takeoff due to a passenger's disruptive behavior. A 25-year-old man was arrested for allegedly threatening to hijack the plane. The FAA reported that the crew reported the incident, which involved the passenger sending a message indicating intentions to hijack. The airline confirmed the flight landed safely, and passengers were rebooked for a flight to Newark the following morning.