South Korean Asiana Airlines charter flight which took off from Wonsan Kalma Airport in North Korea landed at Yangyang Airport in Gangwon Province in South Korea carrying 32 North Koreans, including 10 Olympic athletes, along with the South Korean ski team that had traveled to the North on Wednesday aboard a chartered Asiana Airlines plane for a joint ski training session there.
The flight was operated by Airbus A321-231 reg. HL8060 (no FlightRadar24 antennas in the DPRK) 
This is also the first time that an aircraft registered in South Korea has visited North Korea along the East Sea route. While there were several flights along this route when the Korean Peninsula Energy Development Organization (KEDO) was building light water reactors in South Hamgyong Province as part of the 1994 Agreed Framework stipulations, those flights were reportedly operated by Air Koryo or Air China.
U.S. gave Seoul last-minute green light for chartered flight to North Korea
Despite concerns raised in some quarters that a flight to North Korea would be subject to US sanctions against the North, South Korea and the US have agreed to make an exception for this charter flight.
“In regard to the South Korean delegation using an aircraft to visit North Korea, the government and the US Treasury Department have activated a protocol designed to exempt South Korean companies from the US’s independent sanctions,”
the Ministry of Foreign Affairs told reporters following deliberations with the US. The US prohibits aircraft that have passed through North Korea from landing in the US for 180 days.
Source: Hankyoreh.kr
