Southwest Airlines flight 777 was scheduled to depart Sacramento (SMF) at 18:00 on Sunday, January 5th, with a scheduled arrival into Portland (PDX) at 19:35.
Based on flight tracking data from Flightradar24, the Boeing 737 MAX 8 left the Californian capital at around 20:00, and began its journey north.
The aircraft crossed the border into Oregon around thirty minutes after takeoff and shortly thereafter could be seen turning back as it flew over Cascade-Siskiyou National Monument, the 114,000-acre ecological sanctuary situated at the crossroads of the Cascade, Klamath, and Siskiyou mountain ranges.
The plane then proceeded south, where it landed at Oakland International Airport (OAK) at 21:21 local time.
"Southwest Airlines Flight 777 bound for Portland from Sacramento diverted to Oakland after the Crew received a maintenance indication from an on-board system.
"Safety procedures called for the Crew to bring the aircraft to a stop using only the brakes. Due to weather conditions, which affected braking distance, we elected to divert to Oakland, which had a longer runway available.
"Nothing is more important to Southwest than the Safety of our Customers and Employees."
Upon landing, the plane was evaluated by mechanics, while Southwest found an alternative to transfer the aircraft's passengers the rest of the way to Portland.
A Southwest Airlines official confirmed the carrier accommodated the passengers on another aircraft. Based on flight tracking data, Southwest Airlines flight 777 continued later that day with another Boeing 737 MAX 8 , registered N8773Q.
The second plane took off from Oakland at 23:18 and landed safely in Portland an hour and twenty-three minutes later, at 00:40 this morning.
Following its diversion to Oakland, N8907L was fully operational by this morning. It operated flight WN887 at 07:15 this morning, landing in Long Beach (LGB) just under an hour later.
It is currently en route from Long Beach to Nashville (BNA), where it is expected to land around 15:00.