C5 is moving at full speed to get the 175 on their certificate. I think once that happens, United will give them 175's and they will slowly retire the 145. I don't foresee C5 being put out to pasture as long as they can staff a minimum of 40-50 planes. I have no idea how many planes they are currently flying or how many active pilots they have, just estimating the numbers they would need to maintain to remain viable.