Source: Simon Hradecky | www.avherald.com

A United Boeing 737-9 MAX, registration N37527 performing flight UA-2664 from San Francisco,CA to Baltimore,MD (USA), was climbing out of San Francisco when the crew stopped the climb at FL290 reporting smoke in the cabin and decided to return to San Francisco. The aircraft landed safely on San Francisco’s runway 28R about 55 minutes after departure.

The FAA reported: “United Airlines Flight 2664 safely returned to San Francisco International Airport around 10:40 a.m. local time Tuesday, Sept. 2, after the crew reported smoke in the cabin. The Boeing 737 MAX-9 was travelling to Baltimore/Washington International Airport in Maryland. The FAA will investigate.”

A replacement Boeing 737-9 MAX registration N37528 reached Baltimore with a delay of about 3.5 hours.

The occurrence aircraft is still on the ground in San Francisco about 21 hours after landing back.