Captain Kremin,
I haven't heard if he was sacked, but there are clauses in the QF FAM that prohibit public comment; I am sure the Jetstar contract would be even more specific- hence the name of this thread.
I think the restrictions or clauses only apply in the case of an incident or some sort of operational event where you are representing Qantas. I wouldn't have thought that non-operational statements, of an industrial nature, made as an individual could be restricted.