This might get you pointed in the right direction.

http://uk.reuters.com/article/tnBasi...42652320070926


Jim Carter wrote:
Cite please? I need this information to justify a corporate flying
program.
Based on the first seven months of 2007, Scovel's report found more
than 54,000 scheduled flights affecting nearly 3.7 million passengers
experienced ground delays of 1 to 5 hours or more. That is an
increase of nearly 42 percent over 2006.

Congress is considering legislation that would force airlines to
address the issue. Airlines oppose the measure, saying lawmaker
interference could do more harm than good.