It's historically already there thanks to the Pinnacle SLI. I could have been a line holder in MEM on the 900 with my seniority, but I couldn't bid it due to fences. I was okay with that. What I wasn't okay with was the fact anyone and their brother could bid the -200 because the staffing model they used to come up with the numbers that triggered the fences wasn't anything like what legacy Pinnacle had ever used. Hence, there was no way (short of parking airframes) that people WOULDN'T be able to jump the fence from the 900 or the Q400 to the 200. Mesaba and Colgan had a decent staffing model on their planes. Pinnacle ran so short staffed we would have never hit the trigger to bring a fence UP on the -200 based on the numbers. Honestly, I think the hatred between the groups wouldn't have been so bad if all airframes had just been fenced off. Instead, you've got FOs that were just about to upgrade on the -200 stuck because everyone and their brother on the 900 or the Q400 could jump over for better QoL. Meanwhile, the CA commuting from IAH to MEM or EWR to DTW at Pinnacle had to keep commuting because the Q was fenced.