San Diego International Airport (IATA: SAN, ICAO: KSAN, FAA LID: SAN) , formerly known as Lindbergh Field, is an international airport 3 mi northwest of Downtown San Diego, California, United States. It is owned and operated by the San Diego County Regional Airport Authority.
San Diego International Airport and Lindbergh Field have never operated flights at the same time.
San Diego International Airport is the new name for Lindbergh Field and therefore these two airports cannot have existed at the same time, let alone operated flights at the same time. This means the statement is definitely correct.