Jimmy Carter spotted en route to DC
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Former President Jimmy Carter was spotted on a flight en route to Washington on Thursday for President-elect Donald TrumpDonald John TrumpCorker: US must determine responsibility in Saudi journalist's death Five takeaways from testy Heller-Rosen debate in Nevada Dem senator calls for US action after 'preposterous' Saudi explanation MORE's inauguration.

Carter walked up and down the aisle of a Delta Air Lines flight that left Atlanta, shaking hands with passengers, according to an Atlanta Journal Constitution report.

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Carter was the first former president to say he would attend Trump's Jan. 20 swearing-in ceremony.

Former President Bill ClintonWilliam (Bill) Jefferson ClintonConservatives bankrolled and dominated Kavanaugh confirmation media campaign Sen. Walter Huddleston was a reminder that immigration used to be a bipartisan issue No, civility isn't optional MORE and his wife, Hillary ClintonHillary Diane Rodham ClintonRepublicans bail on Coffman to invest in Miami seat Katy Perry praises Taylor Swift for diving into politics Election Countdown: Small-donor donations explode | Russian woman charged with midterm interference | Takeaways from North Dakota Senate debate | O'Rourke gives 'definitive no' to 2020 run | Dems hope Latino voters turn Arizona blue MORE, the 2016 Democratic presidential nominee, announced earlier this month that they would also attend the inauguration, along with former President George W. Bush.

George H.W. Bush, the nation's 41st president, will not attend. He wrote in a letter to the president-elect that he was not well enough to make an in-person appearance.

"My doctor says if I sit outside in January, it likely will put me six feet under. Same for Barbara. So I guess we're stuck in Texas," Bush wrote earlier this month.

Bush is currently hospitalized after undergoing a procedure to clear his airways on Wednesday.

Carter endorsed Hillary Clinton during the 2016 campaign, though he noted that neither her nor Trump were “quite unpopular.”