Is not CLE-DTW operated by ERJs and 737s? I know in the summers 737-300s make up a good chunk of the CLE-DTW route.
737'S haven't made up a "good chunk" of the CLE-DTW service in 15 years. About 2 years ago, CO did operate one positioning 735 DTW-CLE-SRQ, I believe, but the 735 didn't run CLE-DTW. DTW has been all turboprop/RJ for the better part of a decade now, at the very least.
A few years back CO made a big deal of saying CLE was moving to an all jet hub, but maybe that was a way of sugarcoating a big service cut.
I don't see how it sugarcoated anything, since CLE was the first CO hub to go all-jet in November of 2001. There were cuts in some routes to smaller destinations, mainly because of the runway constraints at CLE-and it was the runway, since some markets like CLE-AZO, CLE-SBN actually were profitable.
I'm no big fan of the B1900, but, as Senior VP Jeff Smisek told us in November, if CO/COEX thinks it can make a few $$$ by bringing back the Beeches on some of these routes, then why not? In this day and age, the carriers are looking for every little advantage to squeeze extra revenue. The upside, of course, is if any of these markets do well, they can always be upgraded to COEX ERJ service.