Cape Air Flight Forced to Turn Back After Cabin Door Opens Mid-Air Over Nantucket

A routine early-morning commuter flight from one of New England's most iconic island destinations turned alarming on Monday when the upper portion of a Cape Air aircraft's main cabin door swung open over Nantucket Sound, forcing the pilot to immediately turn back and return to the departure airport.

The incident occurred on the morning of Monday, April 6, on Cape Air Flight 5001 from Nantucket Memorial Airport to Boston Logan International Airport. The small plane had just taken off from Nantucket Memorial Airport at approximately 7 a.m. when the situation unfolded.

What Happened Onboard

Cape Air confirmed that flight #5001 "experienced an issue in which the upper portion of the main cabin door opened while in flight," according to a spokesperson's statement to WBZ-TV, adding that "the aircraft continued to operate normally." 

Passengers onboard described tense but ultimately controlled moments. Passenger Sheila Fee recalled the sequence of events:

 "The half window flipped up, and then the wind came in, and we were like, 'what?' And the pilot smiled and said, 'everyone stay calm' and were like, 'okay, we're good.'" 

There had been warning signs even before the aircraft left the ground. Fellow passenger Lizbet Fuller noted that when everyone was initially boarding, the window did not seem to latch properly. "The woman was having trouble shutting it from the outside, that was clear, 'whoa,'" Fuller said. 

A passenger video shared on Instagram appears to show the upper portion of the cabin door ajar during the flight, with open sky and ocean visible through the gap. The footage, filmed from inside the small aircraft, shows the door frame and window area partially open as the plane flies at altitude, while passengers remain seated nearby.

Fuller, a Nantucket resident who captured the footage, later posted the video to Instagram with characteristic island stoicism. "Just another flight from Nantucket. But you can get some nice shots without a drone," she wrote. One of her friends replied in the comments: “You are a little too close to that gaping hole.”

Despite her trademark humour, Fuller was candid about the gravity of the experience. "We're lucky to be alive, but as soon as we knew we weren't going to be sucked out of the plane, we were fine," Fuller said. She also praised the crew's composure throughout the ordeal. "The pilot was amazing and made everyone feel calm," she told The Nantucket Current. “It was a bit nerve-wracking even though I'm smiling.”

The Pilot's Response and Safe Return

The pilot maintained the aircraft at low airspeed and continued to operate the plane fairly normally. The pilot quickly returned to Nantucket and landed safely without further incident. No injuries have been reported.

The airline confirmed that the flight crew “landed the aircraft safely without further incident.” Once back on the ground, passengers were able to board a different plane to complete their journey to Boston. 

Aviation Expert Weighs In

Amid the understandably heightened concern among those on board, aviation experts moved quickly to provide context on the actual risk level. Kit Darby, an aviation consultant, explained: 

"It doesn't go above 10,000 feet on a short flight like this – it's capable of going higher, the oxygen, you know it could provide masks, but I'm sure this airplane was at a low altitude, and was not pressurized, so no masks were going to pop out." 

Darby confirmed that the passengers were never in any real danger. The non-pressurised nature of the Cessna 402C on such short, low-altitude routes is a significant operational detail; it means that an open door, while alarming and uncomfortable, does not create the catastrophic, rapid decompression risk associated with incidents aboard pressurised wide-body jets.

A Cape Air Workhorse

According to FlightRadar24, the aircraft was a Cessna 402C, a plane that Cape Air describes as "the workhorse" of its fleet. "The 9-passenger 402 allows for increased frequency, meaning robust schedules that let you fly when you want to, not when you have to," Cape Air's website states. 

Cape Air describes its twin-engine, nine-passenger Cessna 402s as the "workhorse" of the airline's fleet, serving the majority of its destinations. The 1970s-era aircraft have been in service on the Nantucket route for decades. This longevity, while a testament to the aircraft's durability, has prompted renewed questions about the maintenance demands placed on ageing regional aircraft operating in demanding coastal environments.

This is not the first time a Cape Air Cessna 402C has attracted attention for mechanical reasons. In 2024, a Cape Air Cessna 402C landed on one wheel at Logan Airport after experiencing a landing gear issue upon takeoff. 

Cape Air's Response and the Aircraft's Status

Cape Air acted swiftly following the incident. Northeast Regional Marketing Manager Mary Stanley issued a formal statement on behalf of the airline: "Earlier Monday morning, shortly after departing Nantucket Memorial Airport (ACK), flight #5001 experienced an issue in which the upper portion of the main cabin door opened while in flight." 

The airline took the plane out of service and stated: 

"We are following all established safety procedures and will take any necessary actions based on our findings. The safety of our passengers and crew remains our top priority." 

The FAA has initiated a formal investigation into the cabin door malfunction, with initial findings pointing toward potential issues with the door latch mechanism or seal integrity, both components subject to rigorous maintenance schedules under federal aviation regulations. Cape Air has cooperated fully with federal investigators and provided detailed maintenance records for the aircraft. 

About Cape Air

Cape Air is a small but important regional commuter airline based in Hyannis, Massachusetts, specialising in short-hop flights that larger carriers are not capable of serving economically. Originally founded in 1989, it has built its business around thin, high-frequency routes linking places like Nantucket, Martha's Vineyard, Cape Cod, and Boston. The carrier also serves communities in Puerto Rico, the US Virgin Islands, and other small destinations across the Northeast and Caribbean.

The island of Nantucket, which sits approximately 30 miles off Massachusetts' southern coast, is accessible primarily by air and ferry, making reliable air service from carriers like Cape Air essential for residents and visitors alike. For an island community dependent on air links year-round, incidents such as this one carry a significance beyond the immediate flight.

As the FAA's investigation continues, the focus will inevitably turn to pre-departure inspection procedures, door latch integrity checks, and whether the Cessna 402C fleet requires any enhanced maintenance protocols. For now, all passengers reached their destinations safely, and at least one of them did so with a story that will endure long after the flight data recorder data is filed.