I live in NYC but am originally from central Indiana. I have been very curious to try out the new airport at IND (and visit friends -- OK, mostly to see the new airport), but a while back CO switched all EWR-IND service to ERJs (even during the heavy-travel run-up to the Indy 500 in May), which as a plat lessens the fun of the trip for me (no EUA opportunities). However, I notice that starting on September 1, CO has reinstated CO 621 in a 733 or 735 for the indefinite future, without any apparent lessening in flight frequency. I realize that I am perhaps encouraging rank speculation against my better FT judgment, but does anyone have any thoughts on why this might be so?