Ugh, just found out by accident that my CX690 next week has been downgraded from 77W F to regional 333 J. The fare difference for a one-way SIN-HKG is SGD800, but this is a revenue ticket as part of a complex itinerary that I can't reprice now. What sort of downgrade compensation should I expect?
There is another flight with F three hours later but my schedule is inflexible.