I've only booked one award flight before, and that was a domestic US flight. I'm looking to book an award flight in Business JNB-LAS using Skymiles in April. I have a few days of flexibility in either direction. What are my chances of being able to get low-level availability? I'd love to get the AF A380 JNB-CDG involved in one direction or the other, but that would be gravy. Any hints? I have ExpertFlyer alerts for some flights, but I'm not sure when/if I should expect them to come available. Should I book a high-level award now and wait to change as lower-level is available? Should I book Economy now and switch to Business as available? Thanks.