The next airlines to fold are those standing on weak legs already- National and maybe Frontier. I think the latter may lean more on its "parntership" with Continental, but we will likely see 3 major alliances- OneWorld, Star and maybe Wings (more likely a scarmbling of tiertary carriers).

Watch possibly as well for airlines to renegoiate contracts with pilots and FAs until they go through this difficult time. Those who are employee-owned