A post-flight inspection revealed a missing panel on a Boeing 737-800 that had just arrived at its destination in southern Oregon on Friday after flying from San Francisco, officials said, the latest in a series of recent incidents involving aircraft manufactured by the company. United Flight 433 left San Francisco at 10:20 a.m. and landed at Rogue Valley International-Medford Airport in Medford shortly before noon, according to FlightAware. The airport’s director, Amber Judd, said the plane landed safely without incident and the external panel was discovered missing during a post-flight inspection.