The CW in Biloxi/Gulfport

 In AT&T's July Programming Changes update, they said the following:

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September 2016:

AT&T's contract with the programmer for the following channels is set to expire. While these channels will continue to be available to U-verse members so long as AT&T has the rights to carry them, if a reasonable agreement cannot be reached with the programmer the programming will no longer be available. AT&T may modify the channel location for the programming by moving them from their current channel location to a channel between 9501 – 9599, and if a reasonable longer term agreement cannot be reached with the programmers, we may lose the rights to carry them (listed in alphabetical order) in or after September 2016: ...

As well as the following local channels:

(1) In Mississippi, in the Biloxi area, WDSU (channel 4 and 1004 in HD) and WNOL (channel 38 and 1038 in HD).

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I'm not sure what the dispute is with Tribune Media, but you could also ask them why AT&T is is no longer carrying them on U-verse.