I think this depends on whether or not EVERYTHING is retroactive to the amendable date. IMO, that is the very first thing we go into negotiations with. R E T R O A C T I V I T Y... to day 1... with interest.
We have never seen any real retro pay in a contract. If the contract runs 5 years late which is fast looking at recent contracts it would mean the company having to write a 5.5 billion dollar check at contract signing. Not very likely.