Maybe it was United 195 from Dulles to LAX? I watched it for about 5 minutes at just under 200 mph at 0 altitude per the Galileo tracker. I thought something may have been wrong with it because it was due to land at 7:11 and landed in the last 5 minutes. I don't know how the trackers normally show the track, so this is all probably normal.
Here is the link http://www.cheaptickets.com/trs/cheaptickets/galileo_flight_tracker/graphics_results.xsl
They are usually within 5 minutes or so on the trackers. My friend at ATC always reminds me that they do sometimes have to go around weather, so they may have been delayed which doesn't usually show on the tracker.