fly744,
The release letter issue has nothing to do with SIA. The release letter issue is because of Singapore Python Link wanting to nail Poor Chap down.
Apparently, poor chap's long sufferings has surfaced due to his resignations. Singapore Python's face has no where to hide. In order to take revenge, he has come out with this idea. Along the way, he persuaded his comrades, Killer Python and HR mgr, to plan this conspiracy.
Look at Jade, they are not doing these to their expatriates who resign and jump ship to other Chinese airlines. In fact, none of the other Chinese airlines are holding expatriates back, with the threat of not issuing release letters, when the expatriates want to jump ship to other Chinese airlines. China CAA certainly wants to attract expatriates. It will be to their disadvantage in attracting foreigners.
Singapore Python uses his usual techniques. He conspires with his comrades, telling everyone within his arena this story of release letter before the poor chap can be released. Of course, once again, there are people who are his followers, including some blind followers. They, now believe that the release letter is a must.
Of course, the law does not state so. And the CAAC does not recommend that. No companies would want to do this to expatriate pilots except Great Wall, except Singapore Python.
Sentinel,
Get your P1 & P2 ratings opposite intercon hotel along ZhangYang Lu.
Remember to wear pitot cover.