Well... lets see my latest info is (proposed or soon to be in parentheses):
Allegheny - WO US Airways Group
Piedmont - WO US Airways Group
PSA - WO US Airways Group
(Mid Atlantic, if ever - WO US Airways Group)
Mesa Airlines - Mesa Air Group
Air Midwest -Mesa Air Group
Chautauqua - Wexford Mgmt
Shuttle America - Wexford Mgmt
Midway - Wexford Mgmt
(Repulic, if ever - Wexford Mgmt)
Colgan Air
Trans States
So I guess that makes 10 Express partners, maybe going to 12 (depending on how you count MAA)... But I guess they are really controlled by 5 management groups, including the US Airways Group. Still 10 to 12 separate certificates seems like alot to manage.
Still DL has 5 partners - ASA (Wholly owned), Comair (Wholly owned), Sky West, Chautauqua, and ACA, and the were still able to "whip saw" the Comair pilots, with 1/2 the number of partners... Although the 3 month Comair strike did hurt DL to some degree financially.