Why the ‘O’ in San Francisco’s Airport Code, SFO?

Bay Curious - A podcast by KQED - Thursdays

Why the "O" in SFO? And why is one of Chicago's airports coded ORD? And IAD for Dulles? Reported by Jessica Placzek. Bay Curious is Olivia Allen-Price, Vinnee Tong, Paul Lancour, Suzie Racho, Penny Nelson and Julia McEvoy. Theme music by Pat Mesiti-Miller. Ask us a question at BayCurious.org. Follow Olivia Allen-Price on Twitter @oallenprice.