Originally Posted by
Flymeaway
Wholly owned.
American owns Piedmont, Envoy, PSA. Delta owns Endeavor. I think United now holds a majority share of Expressjet, and so they might be considered/treated as a WO as well.
United owns 49% of ManaAir, which is the sole owner of ExpressJet, so only a minority owner. But the other 51% has close ties to UA as well.