Wow! 11 companies in that list including 9 regionals (NW Airlink is really Compass + Pinnacle + Mesaba) & one somewhat shared ground services company. Throw in a couple legacy carriers and a 47% (or whatever) interest in YX and you have the makings of ... Delta Airlines. Just what is Delta, anyway?

Meanwhile, back on subject -- I'd suggest you use them as intended. This is an old (and generally well-liked) practice that is being revived. Not every little thing that comes down needs to be turned in an ad hoc protest. It is somewhat dismaying to see the owned regionals (Comair, Mesaba, Compass) & DGS excluded, but a TTU should serve to register that protest.