JimBall has it right and the 'Flight' artile confirms the basic facts.
JerryG's kind comments were very well recieved. He will be well aware that Mountain Biking is just about the only event that allows for any creativity from the film crew which is why I selfishly allocated that event to myself. I am, nonetheless, very proud of the output from the entire team delivered without a single hitch. I have little to say about the opening/closing ceremonies where our input was minimal.
I haven't seen any of the footage Rotorfan mentions as it's only available on NBC. Those beauty shots were done last summer by the multiple award winning operator Dave Manton of ACS. Again I was privilleged to be the driver for those sequences.