144h visa free Nanjing-Shanghai

Hi, I would like an information, I'm planning a short tour between Nanjing & Shanghai, it will be possible with the 144h transit free arrive in Nanjing's airport from Bangkok and depart after 6 days from Shanghai's Pudong Airport to Macau (or Hong Kong)? Or I have to arrive and depart from the same airport? Thx in Advance. Simone.