United Airlines crew finds panel missing on Boeing 737 plane after landing

A Boeing 737-800 aircraft operated by United Airlines flew Friday with a large part of its exterior missing, according to the airline, marking the latest in a series of malfunctions to plague the manufacturer.

The flight from San Francisco to Oregon landed safely, but upon arrival crews discovered a broken exterior panel on the 25-year-old aircraft.

According to a statement from United Airlines, no emergency had been declared and the missing piece was not discovered until all 139…