An Air China airplane was detected departing from the airport in Pyongyang at 08:30 a.m. local time.

Axar.az reports quoting Yonhap News Agency.

Kim Jong-un has boarded a Chinese private Boeing 747 jet commonly used by high-ranking Chinese officials, the Yonhap news agency reported, citing sources.

The popular plane tracking online source Flightradar24, however, reportedly did not specify the destination of the aircraft. The website has also not detected any other flights departing from North Korea. According to Yonhap, many government chartered planes are known to keep their routes secret due to security issues.

Meanwhile, US President Donald Trump has also departed for Singapore, where he is expected to meet with the North Korean leader on Tuesday, the White House said on Saturday. Trump took off from Canada on Saturday, after participating in the Group of Seven (G7) summit, and is expected to arrive in Singapore on Sunday.

According to Japan’s Kyodo News agency, citing a diplomatic source, the North Korean leader will arrive in Singapore on Sunday.

Earlier, a South Korean Air Force official told the South China Morning Post that Chinese fighter jets would secure Kim's flight route to the historic meeting.

The US-North Korean summit will mark the first-ever meeting of the leaders of the two countries. The highly-anticipated talks were put at risk following Trump's May 24 declaration that he was canceling the meeting with Kim over Pyongyang's hostile rhetoric. Last week, however, Trump reinstated the summit after meeting with Kim's top aide, Central Committee of the Workers' Party of Korea Vice Chairman Kim Yong Chol, at the White House.