This is a good idea. I've been in Shanghai eight months now and have been taking the opportunity to see things in the area. I've had only one flight leave on time and that was a first of the day flight to Haikou. Even my international flights to FRA and EWR have been delayed though not as bad as the others.

However, it does seem, based on my observations while being delayed myself, that flights to Guangdong and Hainan get delayed the most frequently regardless of airline (of course, most of my flights have been to and from those regions).

My biggest frustration is that there usually is no information at PVG about a delay. It just says delay. Seems less common at the out stations. I've also missed a delayed flight when I didn't hear any announcements about boarding and had my back to the gate (never do that again).

I've been delayed on:
PVG-SZX (5 hours) - Shenzhen Airlines
SZX-PVG (3 hours) - Shenzhen Airlines
PVG-HAK (Between 1-5 hours) - Hainan Airlines, Beijing Capital Airlines
HAK-PVG (Between 1-3 hours) - Hainan Airlines, China Southern
SHA-CAN (2 hours) - Shanghai Airlines (switch from China Southern due to a potential missed connection)
CAN-PVG (5 hours) - China Southern