Two Delta Air Lines flights bound for S.F. suffer engine failure

Delta Airlines jets encountered four major incidents within 48 hours last week, including two flights bound for San Francisco.

Flight DL-475 from Boston to San Francisco reversed course mid-flight when one engine failed during takeoff on Thursday, aviation records show. 

The Airbus A321-200N crew initially stabilized at 1,500 feet, then ascended to 2,000 feet before safely returning to Boston Logan International Airport approximately 20 minutes after departure. 

The aircraft, registered as