The only time I have ever seen anyone over 100 credit was before FAR 117 and when their trips were dropped due to IOE (in which case the pilot who was dropped gets paid as if he/she was doing the trip) During that time the pilot that was dropped would pick up trips on open-time and get paid at 150%. But those days are over. Picking up open-time is difficult because the company awards left over trips to Reserve pilots without allowing Line Holders to bid for them first. This is against the "Contract" and was apparently "fixed".

If your line was 120 credit and none of the criterieas above applied, then you were not legal to fly based on FAR 117 rules. There were a lot of lines awarded while I was there that were not 117 compliant.