Originally Posted by
serfty
For an airline to substitute equipment that does not support the cabin originally booked should be (and IMHO, is) completely different.
Not sure if it helps the OP, but my wife and I were downgraded from F to J on an AONE with BA due to a staffing issue, and they gave us 1000 GBP each on prepaid credit cards. Got it at check-in, too, when they explained the downgrade.