Originally Posted by
etudiant
Although Wuhan is perhaps the largest switching point in China, it is not the primary departure point for international flights.
My guess is many passengers from Beijing or similar airports got there via a change of trains in Wuhan.
So the effort, although laudable, is far from airtight.
That seems far stretched. Wuhan is 4 hours from Beijing and Shanghai, and that's not counting the time needed to get to the airport from the train (adding another hour). Most people will have connecting itineraries from WUH via Beijing, Shanghai, HKG, or other airports. The number of people on US-bound itineraries taking the train through Wuhan to get to another airport will be miniscule compared to people on tickets originating on Wuhan.