Charlie Sheen Flying Back to L.A.

TMZ has learned ... Charlie Sheen is in the air right now, flying back from Las Vegas to L.A., where he's due on the "Two and a Half Men" set at 10 AM PT.

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Sheen checked out of The Palms Hotel just before 9 AM and is taking a private jet back to L.A.

We're told there will be "discussions" today with Charlie about his well-being, after going on a bender in Vegas this weekend.