Originally Posted by fastair

Most likely, you think wrong.
Low visibility=reduced ATC rates=less planes get to land. It doesn't mean that one plane is not physically capable of landing, just that the ATC system cannot keep up with a full load of flights so they instruct carriers to delay/cncl some. Because the later flight or F9 wasn't one of the ones that was cncl, in no way makes fog less of a reason for a wx cncl than if they had cncld every flight that day.

Plus if the flights were 1/2 full, and there was a flight to s terminating airport (like SAN) then every person could have been accommodated on the remaining flight. So what compensation would be required for those that spent the night in DEN when there were enough seats for everyone? Who would have incurred hotel costs?

A 10 sec google search confirms almost zero visibility and fog. Much faster than coming here and posting crazy speculative stories.

Follow this link, look at the visibility when you would have landed. That doesn't look like great wx for landing lots of planes around the same time.
http://www.weather.com/outlook/trave...=0&when=110309