Update: Yes, Fox did it again; new deadline is Friday. Now back to our story filed earlier today:

Fox has — once again — extended its deadline for a carriage agreement with Charter by one day.

That means that every day this week, Fox has extended its threat to pull its channels from the cable operator by one day.  It’s unclear if the series of extensions means the companies are close to an agreement, or Fox simply is leery of taking its channels off the nation’s second largest cable operator when spring viewership remains high.

Either way, the latest delay makes today (Thursday, April 13) the new D-Day for Charter to sign a new carriage agreement or risk losing more than 20 Fox-owned channels.

That is, unless Fox extends the deadline again later today.

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Once again, Fox did not offer a reason for the one-day extension at its web site, KeepMyNets.com, and Charter did not issue a statement on the negotiations.

“Attention Charter Spectrum Customers – Including Former Time Warmer Cable and Bright House Networks customers. You May Lose Your Favorite Shows and Sports Tomorrow, Thursday April 12,” KeepMyNets.com now says.

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If the two companies can’t reach a deal, channels that could be blacked out include FX, National Geographic, the Fox Sports channel, the Fox-owned regional sports channels, and Fox Deportes. (Pictured above: The Americans on FX.)

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Fox and Charter and battling over carriage fees — how much the cable op should pay for Fox’s channels.

— Phillip Swann