I think you HAVE to apply on www.airlineapps.com and i think it will only go through if you have 50 hours or more. Again there are multiple people that I know at comair and just about every other airline that have less than 100 multi hours most around 60 lowest time i have heard of someone gettin on at comair is 620 tt

I have a buddy at Air wisconsin that got on at 280 TT
I have multiple friends at Pinnacle that got on at about 500/50 and know people there that got hired with less than 300 TT

there are a ton of jobs available out there to pilots with low time, everyone at comair that I know though has done flight instruction or some other form of flying for a while before coming here

Good luck to all!