I'm not in charge just a humble moderator
, however the OP might care to read a book 'The Quest For Global Quality' by Chang Zeph Yun, Yeong Wee Yong and Lawrence Loh. I wouldn't describe it as in anyway exciting and it is difficult to get hold of along with being very expensive but there are interesting sections never less.
In all honesty it is not solely about recruitment and I think you may have some difficulty in finding information as airlines like many other employers will by necessity keep many things confidential. This no doubt is prevent applicants applying with pre-conceived knowledge of their procedures.