Domestic flights in China are often delayed due to weather or congestion in route because the People's Liberation Army Air Force control the airspace too tightl

Domestic flights in China are often delayed due to weather or congestion in route because the People's Liberation Army Air Force control the airspace too tightly. Shanghai-Beijing HSR takes longer than air flight but in certain times of year, when delays are common, HSR can be competitive, plus you are online the entire time.