Just so I am perfectly clear and I know it says it but I want to be positive I understand this correctly. As a teacher in Korea I am flying back to Seoul from Hanoi and am making a stop in Shanghai but then must switch from Pu Dong to Hongqiao. It is a 10 hour stop so I am allowed to transit between airports without a visa? I know it says "transit" and "enter city" but I want to be sure I don't mess up my work visa here in Korea. Mr. Sherman's post made me nervous about this point.