The FBI never opened an investigation against the "Allied" actor, 52, because there was "no case", reported TMZ.
"The FBI is still working to gather the facts from the incident but the agency does not consider it an official investigation," sources said.
Pitt and his estranged wife, Angelina Jolie (who filed for divorce less than a week after incident occurred), were flying with their six children from Nice, France, to Burbank, California, on September 14.
It was earlier reported that the "Fight Club" actor got "verbally abusive and physical" with the kids, Maddox, 15, Pax, 12, Zahara, 11, Shiloh, 10, and 8-year-old twins Knox and Vivienne.
The former power couple have since reached a temporary custody agreement, which allows Pitt supervised visitation. He will also voluntarily take random drug and alcohol tests, his first of which came back negative.
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