If anybody has any BTS data comparing on-time performance of MSP and DTW arrivals, please share. It's certainly frustrating to be close, but not at, the gate, but across the 10s of thousands of flights a day, long waits just for a gate are not all that common.

% on time arrivals
city April '08 ytd 2007

DTW 74.37 73.74
MSP 75.11 72.57

ATL 73.74 74.44
EWR 61.85 59.45
ORD 59.27 65.88

Given NW's relative dominance at DTW and MSP, it's not possible for another airline to perform so poorly as to skew results significantly.