What's the problem with the Shanghai-Beijing flights these days?

Yesterday we had a Tudou board meeting, and two of our VC's had flown in from Beijing the day before. At least that was the plan, because both had about a 12 hour delay (meaning sitting in the plane on the tarmac for 12 hours, with the plane eventually running out of drinks for the passengers). Today I read on Twitter that David Feng had a 7 hour delay yesterday, flying from Shanghai to Beijing.

What I heard from one person is that the pilot did not want to give a reason why they had such a long delay, and for a long time they did not even know whether they would ever take off or not. I wonder what's the problem on this route? Are there secret military exercises, like I once had with a severely delayed flight to Macau? And why can they not inform the passengers in advance? In one plane it apparently got so bad that passengers started to beat up the airplane crew, and some people had blood on their shirts.

I fly regularly in China, and normally flights are reasonably on time and the service is quite okay (I still don't eat Chinese airplane food though). But every now and then you hear these horror stories, and nobody really knows why this is happening. If China truly wants to be a modern first-world country this kind of delays without any explanations should not happen. I checked both yesterday's and today's Shanghai Daily for the reason of the delays, but as expected I did not see any article about it. Does anybody know what's going on?


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