BirdmanBerry;
I've been through this, albeit not in the aviation sector. You are correct that a company cannot make a position redundant only to employ again in the exact job role, but this isn't what's happening. BA want to change their employees contracts, which requires the employees to agree. If employees don't agree then they can be dismissed for 'some other substantial reason'. BA can then offer to re-employ them under new terms, BUT (and it's a very big BUT) doing so could lead to unfair dismissal claims.