Lee's visit this week was the first by a South Korean leader to China in six years, with Seoul seeking a reset in relations with its largest trading partner as well as help with the North.
The world's most punctual airlines have been revealed - including three European carriers. The top 10 global airlines includes a number based in North and Latin America.
Kim was inspecting the construction of a memorial for North Korean troops who died fighting overseas along with his daughter Ju Ae, state media KCNA reported.