This is like one of those stat.'s in baseball I didn't even know they were keeping track of. But here's the article:

http://www.sunherald.com/mld/sunhera...on/7552328.htm

Among the country's 10 largest airports, D/FW had the longest taxi time for arriving planes during the first 11 months of 2003, federal data show. On average, a plane traveled 10.48 minutes between runway and gate, with 3.81 minutes of that considered delays.