United 737 MAX 9 Squawks 7500 After Cockpit Breach Attempt

A United Airlines Boeing 737 MAX 9 squawked the 7500 hijack code on Monday 9 November after a male passenger tried to storm the cockpit and claimed to be carrying a bomb. The aircraft, operating flight UA2174 from Newark, landed without injuries at Louis Armstrong New Orleans International Airport at 11:07 PM local time. Neither United nor the authorities had released further details at the time of writing.

What happened on the flight to New Orleans?

UA2174 is a regular evening service between Newark Liberty and New Orleans. The jet departed Newark at 9:26 PM local time, according to Simple Flying. The pilots selected 7500 as the aircraft descended through 20,000 feet on approach.

Flight tracking platform FlightDeck first flagged the emergency on X, noting the jet was squawking 7500 due to a threat. The platform then reported that a male passenger had tried to breach the cockpit. The crew later reported that the man was carrying a backpack, which he claimed held an explosive device.

The aircraft taxied to its gate on arrival. By that point, Simple Flying reports, the passenger was sitting with cabin crew at the back of the aircraft. No agency has yet confirmed whether officers met the jet or made an arrest.

A Level 4 alert sent across the United fleet

The crew also warned other United aircraft through ACARS (a datalink system that exchanges text messages between aircraft and the ground). The message FlightDeck shared read: "WE HAD AN ATTEMPTED LEVEL 4 NO OTHER DETAILS ARE KNOWN AT THIS TIME."

US airlines and authorities grade onboard threats on a scale from Level 1 to Level 4. Level 1 covers verbal disruption; Level 4 means an attempted or actual breach of the flight deck. The crew on UA2174 therefore declared the most serious category of onboard security event.

What does squawk 7500 change for the flight?

Squawk codes are four-digit numbers that pilots enter into the transponder to communicate with air traffic control. The code 7700 signals a general emergency, 7600 indicates radio failure, and 7500 signals unlawful interference, which includes hijacking.

The mechanism matters because pilots can select 7500 without saying a word on the radio. This alerts controllers while the person behind the threat remains unaware that the ground knows. Controllers then confirm the code with the crew and coordinate a security response on the ground — in this case, an otherwise normal landing at the destination.

A nearly new airframe

The aircraft involved was N17422, a 737 MAX 9 less than a year old. Planespotters data shows Boeing built the jet at Renton with manufacturer serial number 43457 and line number 9425.

United took delivery in February 2026, and the jet entered service on 7 February as fleet number 7422. The airline leases the aircraft, which carries two CFM International LEAP-1B engines and 179 seats: 20 in United First and 159 in economy. The full flight track is available on Flightradar24.

Second United security scare in weeks

The New Orleans incident follows another United security event in October. A United 737 MAX 8 flying from Las Vegas to Newark returned to Harry Reid International Airport after a flight attendant spotted a passenger texting about a hijacking. Police later arrested that man, Simple Flying reports.

With no arrest yet confirmed in New Orleans and neither United nor authorities providing details, the open questions are whether the threat was credible and what charges may follow.