Southwest 737 Returns to LaGuardia After Cockpit Fumes Emergency

On Feb. 10, 2026, Southwest Airlines Flight 4656, a Boeing 737-700 registered N488WN, declared an emergency and returned to New York LaGuardia Airport after the crew reported fumes in the cockpit shortly after takeoff bound for Chicago Midway. The aircraft was climbing through 8,000 feet when pilots donned oxygen masks and notified air traffic control of the emergency situation.

The flight crew followed standard emergency procedures, verifying no smoke was present in the passenger cabin and coordinating with flight attendants before initiating the return to LaGuardia. Controllers vectored the aircraft back to the airport, where the crew completed an ILS approach to runway 22 and landed safely with no injuries reported among the passengers or crew.

The incident highlights ongoing concerns with cockpit fumes on LEAP-1B equipped aircraft. The NTSB has attributed similar incidents to engine oil leaks caused by activation of the load reduction device (LRD) on CFM International LEAP-1B engines, which can allow oil to enter the bleed air system. Following previous incidents, the NTSB issued safety recommendations for preventing smoke and fumes during LRD activation, and Boeing has updated flight crew procedures for engine failures involving smoke or fumes.