I have booked a reward ticket from Sydney to London in a few months time . It’s a first class ticket and I’m very excited , but both legs are on the triple seven as that is all that was available . I can see that there are a lot of flights between Sydney and Singapore within 24 hours of the flight I have booked. Is there any flexibility at all for me to just change one leg so that I am on the airbus A380? If so, what’s the best way to go about it. This is my first flight for Singapore and I don’t really understand the rules.