The top portion of this NTSB graphic, created from Harris Symphony OpsVue radar track data analysis, depicts the positions of aircraft on an overhead view of the runways and taxiways at San Francisco International Airport. The text is from a transmission to air traffic control from a United Airlines airplane on the taxiway.  The bottom photo, taken from San Francisco International Airport video, shows Air Canada Flight 759 passing over the United Airlines airplane.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/68618467@N03">National Transportation Safety Board</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/ntsb/36167773772/">SFO diagram</a>