As Harris descended from the vice-presidential Air Force Two at the Charlotte airport on Saturday, Trump's private Boeing 757 was parked on the tarmac nearby.
The close encounter was a dramatic illustration of how the two candidates are focusing on a handful of states where Tuesday's US presidential election will be won or lost.
Kamala Harris arrived at Charlotte airport to see Donald Trump's private Boeing 757 on the tarmac. (AP PHOTO)
It was the fourth day in a row that the candidates were campaigning in the same state. Only seven states, North Carolina among them, are seen as truly competitive.
Harris was arriving for a rally with rock star Bon Jovi. Trump had campaigned in suburban Gastonia a few hours earlier and it was not clear whether he was on his plane when Harris arrived.
With the election just three days away, Trump and Harris stuck to familiar themes.
Trump said he would deport millions of immigrants if elected and warned that if Harris were to win, "every town in America would be turned into a squalid, dangerous refugee camp".
Campaigning in Atlanta, Harris said Trump would abuse his power if he returns to the White House.
"This is someone who is increasingly unstable, obsessed with revenge, consumed with grievance and the man is out for unchecked power," she said.
More than 72 million Americans have already cast ballots, according to the Election Lab at the University of Florida, short of 2020's record early-voting pace during COVID-19, but still indicating a high level of voter enthusiasm.
Some four million votes have already been cast in North Carolina and the western counties that have been devastated by Hurricane Helene appeared to be voting at roughly the same rate as the rest of the state, according to Catawba College political science professor Michael Bitzer.
Trump criticised the federal government's response to the disaster and repeated his false claim that aid had been diverted from the state to help immigrants entering the country.
Donald Trump says he's running for office to save the US economy. (AP PHOTO)
At a later rally in Salem, Virginia, Trump said he ran for office to rescue the economy from "obliteration", even though it would have been easier to relax at one of his oceanfront resorts.
"I didn't need to be here today," he said.
"I could have been standing on that beach, my beautiful white skin getting nice and being smacked, being smacked in the face by a wave loaded up with salt water."
Trump was joined on stage by women from a local college swim team who have objected to competing against transgender athletes.Â
Some of Trump's TV ads have also sought to capitalise on transgender controversies.
Harris and Trump have very different policies on major issues including support for Ukraine and NATO, abortion rights, immigration, taxes, democratic principles and tariffs, which reflect the schisms between the Democratic and Republican parties.
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