I currently fly for a Part 135 operator and have the following:

ATP
4100 TT
2700 Multi
3600 PIC (2300 Part 135 PIC)

The caveat is all my time is piston. Is that going to be a disqualifier? I know and have talked with a number of JB pilots and they all tell me to apply regardless. I'm in my 50's so I have a limited timeframe to work with in the 121 world.