One the World’s Busiest Airports With Just a Single Runway in California Formerly called Lindbergh Field, San Diego International Airport features only one 9,401-foot-long runway, making it the busiest single-runway airport in the U.S. A record-breaking 25.2 million passengers used the airport in 2019, and while the numbers dropped considerably during the pandemic, they rebounded to 24.06 million passengers in 2022.  The landing approach here is famous for how close jets get to the skyscrapers of downtown San Diego, and because of its urban location, the airport can’t build any additional runways. Around the terminals, though, the Arts Program strives to keep travelers in a zen-like frame of mind through rotating exhibitions and performing arts events.