on the flights that i usually take....First one out on MOnday morning YYZ to PHL, and the last one out on Thursday night from PHL to YYZ has always been full or near capacity in one of those CRJ's...at least 40+ each flight..

I've only been flying this route recently(last 3 months)....and the thursday flight is the worse....I think I am batting about .500 in terms of getting flight cancel.
I will be flying this route for the next year unfortunately...client is in Delaware...so time driving from PHL or BWI is almost the same....so I might try out BWI....

The last time that I travel extensively to PHL..it was about 5-6 years ago, and I remember that AC used much bigger planes....Airbus 319 or 320's......and it was great....
now with those CRJ's....I was talking to the United agent at PHL desk, and she mentioned that those CRJ's always have mechanical problems and they would cancel the flight and put the passenger up with hotel vouchers....