Fog is a common reason for delayed flights into SFO, as reduced visibility prevents planes from being able to land side by side, halving the rate at which plane

Fog is a common reason for delayed flights into SFO, as reduced visibility prevents planes from being able to land side by side, halving the rate at which planes are able to land [1]. I don't know if this leads to many flights being canceled outright, but I have certainly experienced massive delays flying into SFO due to fog - typicially on shorter regional flights where ATC will prevent your plane from even taking off at the point of departure due to congestion at SFO. [1] https://www.kqed.org/news/11772407/why-is-sfo-so-delayed https://www.kqed.org/news/11772407/why-is-sfo-so-delayed