Also, if assigned a non-contractually compliant seat and it isn’t fixed you can still choose to take the assigned seat. If you do you’ll receive a banked first class seat to cash in at a later date on a flight where you wouldn’t otherwise be contractually entitled to a first class seat - Like a deviated deadhead (we still get positive space if we deviate, just not first class) or to and from long term training.

We do have a carve out in the contract for deadheading on the CRJ-200 which doesn’t have first class or economy plus seating. It’s a tin can full of seats of equal misery.