North Korea's top negotiator, Kim Yong-chol, is expected to visit the United States on Thursday to discuss details of a second summit between the two nations. 

According to a Chinese airport official on Wednesday, North Korean officials including Kim booked tickets for a United Airlines flight to depart for Washington at 6:25 p.m. on Thursday. 

CNN also reported on Wednesday that Kim Yong-chol plans to arrive in Washington Thursday for a two-day stay, citing two U.S. sources familiar with ongoing negotiations.

The report said Kim is expected to hold talks with Secretary of State Mike Pompeo on details of a planned summit between President Donald Trump and North Korean leader Kim Jong-un.