Washington DC - Two giant pandas arrived at the Washington Zoo on Tuesday in the latest chapter in China's campaign of international "panda diplomacy."

Bao Li, a male panda, and Qing Bao, a female, were flown from Chengdu to Dulles airport in Virginia aboard a FedEx Boeing 777F cargo plane dubbed the "Panda Express," the Smithsonian National Zoo said.

The 3-year-old bears were then loaded onto trucks and taken to their new home at the zoo in the US capital.

"Bao Li and Qing Bao exited their crates and began exploring their new indoor enclosures, in which keepers placed ample bamboo for the bears to eat," a zoo statement said.

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It said they will be quarantined for at least 30 days and will not go on public display until January 24, 2025.

"We're thrilled to welcome Bao Li and Qing Bao to Washington," said Brandie Smith, director of the National Zoo and Conservation Biology Institute.

"Today we joyfully celebrate a new chapter of our 52-year-long giant panda breeding and conservation program."

Only a few of the beloved black-and-white bears remain in the US after almost all were returned to China in recent years under pre-arranged contracts – including all three of the National Zoo's pandas last November.

A popular Giant Panda Cam will be relaunched once the bears make their public debut in January.