RDG ...
It's sort of an interesting question in that Korean Air asserts that it has the unilateral right to modify a contract between yourself and the contracting company which it is not even a direct party to. The contracting company simply states that they are obliged to change terms in accordance with their master contract with Korean. Of course they don't have that right within the contract they signed with you, but unless you are prepared to go to Vanuatu or wherever to try and get the thing enforced that really doesn't mean anything anyway.
This particular email dates from 2003 when I was still working for Korean Air. You may recall that the job market then was not quite as it is now and telling them to go piss up a rope (no matter how well deserved) was not not an immediately actionable response. I'm now much more happily employed elsewhere. I've attached the email simply as a concrete example of what the value of a Korean contract is for those considering the position.
ELAC