However, if the North Koreans had decided to go cheap on the charter rates, you get what your cash gets .......
Come to think of it, riding on P.R.Chinas metal is probably the safest bet for young Kim. If you check his routing, the flight tried to stay on Chinese airspace and Vietnamese airspace (another socialist nation) for as long as possible.
It goes to show that China is still influential when it comes to the business of their North Korean brethren. It is quite possible that China is footing the bill for the 747-400 transport. By the way, B-2447, a 23 year old B747-400, has headed back to Beijing after delivering young Kim to Singapore.
Trump has arrived in Singapore on the same day but at night.
Looking at it, of course Kim would fly on the Air China 747 as that is much newer than his VIP soviet plane. Believed too that China have offered or Kim have requested China's assistance in providing the 747 and likely that Kim or NK is not paying for it - just like for Kim stay in St Regis is picked by by the S'pore govt.
His IL-62M (P-885) has arrived in Singapore too.