For an SLI to happen the company would have to merge the regionals, and if there is a merger then ALPA already has guidance on how to merge regionals. This would be up to the unions, the problem often in mergers is not the SLI (except US Airways) but rather agreeing to a single contract.

US Airways asked the pilot groups to agree to an SLI before a contract would be hammered out and since they didn't agree with the rulings and such the two pilot groups are still split. United handled it a bit different and US Airways wanted to ensure this didn't happen again even tho they made money from it last time around and that's why there was the birth of the MOU. If they are to merge the regionals I think the SLI won't be the problem, it will be the contract and I see this as the reason they are going from airline to airline for concessions as to use those rates for the merged regionals. I believe they will merge the regionals after they get either PSA or Eagle to take concessions.