Thanks for all the replys.

The flight and day combo I mentioned was just an example ... the maint. delay was coincidence. This is a regular occurance on routes to/from Washington-Dulles. And I've noted it's a DC-9-30 both into and out of DTW.

The engine thing might be it ... but Dulles has 10k+ foot runways so there's not a performance problem there. Maybe Bay City MI has short runways??

I'm used to the direct "marketing" from Delta ... but NW definitely has more "equip changes" in DTW than I ever saw DL have in ATL.

Maybe there's an ops person who could (anonymously, of course) chime in. Or maybe I should be paging B747-347 ...

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Leo showed us his new loyalty program so we showed him ours ...
2003 DL spend = $0
2003 NW spend = $21.4k and increasing