A couple of things to add: Having watched the planes land at SFO at night provides an additional context. There are often two long streams of planes, like a sp

A couple of things to add: Having watched the planes land at SFO at night provides an additional context. There are often two long streams of planes, like a spaced necklace, coming in to land. They look far apart when flying but then you notice just have fast another one comes. And to those who fault the traffic controller - it is on the controller if something bad happens. Politeness, even a charge of grumpiness goes out the window in the face of that responsibility. Period. IMHO.