Following the shutdowns of UPN and The WB, CBS Corporation (former owner of UPN) and Warner Bros. Entertainment became co-owners of the new CW Television Network, which largely merged the programming from both networks onto the scheduling model used by The WB. The network launched in September 2006 on 11 UPN stations owned by CBS Corporation, and 15 WB affiliates owned by Tribune (which exchanged its ownership stake in The WB for affiliation agreements on most of its stations with the new CW network). Certain UPN and WB affiliates in markets where Tribune and CBS both owned stations carrying those networks either picked up a MyNetworkTV affiliation or became independent stations. The standard definition of an O&O again does not apply to The CW (in this case, CBS Corporation owns some of the core CW outlets, while Time Warner does not own a CW station or "any" station beyond one), but the CBS-owned stations that carry the network may be referred to as "CW O&Os".