We are booked on Cathay Pacific from Delhi to Sydney via HK on 1st & 2nd April. CX has done the sneaky trick of changing our seats on the HK SYD leg and put us in the middle four seat row in premium economy and didn't let us know. They have advised that all of our preferred window/aisle seats are booked. Swapping our two pre-requested and confirmed seats for inferior ones suggests someone more important than us wanted our seats! Does anyone know if CX offers a business class upgrade close to the flight date by the passenger offering a price to upgrade? It would be nice to upgrade for that last 9 hour leg if we could do so at a reasonable cost.