CNN Fareed Zakaria GPS July 7, 2013 14:48:00
Passengers prior to that plane crashing. we also know that the instrument landing system, the ils system here at san francisco airport, was not functional at the airport at that time, that runway. it is not clear that that contributed to this problem. the boeing 777 does have a backup. we will be looking at all that coming up. let's go now to the other big international story of the day, the hunt for edward snowden. at this hour, he is believed to be still hold up in the transit area of moscow's airport, but in recent days, no fewer than three latin american countries -- venezuela, bolivia a...