CCX, CSX, CWX, CEX.....All originally spun off from Consolidated Freightways (a union company). Also, the Freightliner (Tractors) name brand was started by Consolidated Freightways.
Consolidated Freightways was the the No. 1 carrier for several years. Before the demise of CF, freight was deverted to Con-Way, thats how they accumulated customers, so fast, and in a short amount of time. If it were not for CF, there would not be Con-Way. It's ironic for Con-Way, also to use the acronym, that is associated with Consolidated Freightways.
As for the demise of so many union carriers, it is attributed to the fact that the turn over rate for these drivers at union companies is very low. That is why it's more expensive to operate these companies. At non-union companies the turn over rate is much more, therefore less pay, less benefits, less vacation time, less overtime pay. And they could fire at will or simply lay-off, without justification. The turn over rate at union companies is so low that some seniority list are 10+ years and growing.