Porsha Williams is on the radar of federal authorities ... after allegedly being involved in an incident on a Delta flight.

The incident apparently went down Sunday night on a flight from Las Vegas to Atlanta. In footage, obtained by TMZ, Porsha is seen strutting out of the gate in a fur coat and Uggs --and from the looks of it, she doesn’t seem fazed at all. TMZ.com

The reality star is accompanied by an officer, who she appears to speak with shortly after deplaning.

A spokesperson for FBI Atlanta tells TMZ … "FBI Atlanta is aware of incident on a Delta flight on November 16th allegedly involving Porsha Williams and/or at least one other person. We are looking to see whether any federal charges may or may not apply."

A spokesperson for Delta Airlines tells TMZ ... two customers on

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