Originally Posted by
craigthemif
If an F award opens up in a half-full cabin, chances are good that J and perhaps PE are getting quite full. So getting somebody to pay in advance for a likely opup is a win for BA...
I think in that situation it’s more likely that cheap online upgrade offers and airport upgrade offers will appear. The Avios seat in a less than half full cabin is probably just a quiet flight in general. This is just my speculation though.