Those contractors agencies are the EBOLA equivalent in the Civil aviation jobs. It really should be banned from the industry. Pilots, cabin crews and engineers should be directly employed by their airline company with a proper contract.
Why isn't this so in Euroland? In the US, the union contract and even most non-union carriers, all flying must be done with employees--the scope clause. The carrier just cannot go out and hire contractors. Seems an obvious contract issue.