ATLANTA (AP) -- Former President Jimmy Carter took time to shake the hand of every passenger aboard a recent commercial flight from Atlanta to Washington.

James Parker Sheffield was aboard the flight last week and tweeted video of the smiling 92-year-old walking down the aisle and shaking hands with everyone aboard. Sheffield tells Atlanta's WSB-TV that Carter's enthusiasm was "authentic and humble."

Carter spokeswoman Deanna Congileo says that Carter has shaken hands with travelers on planes for decades since leaving office and "enjoys it."

Carter was flying to Washington ahead of Friday's funeral for his former national security adviser Zbigniew Brzezinski, when he greeted everyone.  Sheffield wrote on Twitter "Jimmy Carter is on my plane to DC from ATL and just shook every hand of every passenger."

Sheffield's video of Carter exchanging pleasantries with passengers has been widely-shared online. As of Monday morning, it had been retweeted more than 12,000 times and liked more than 34,000.

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