Well, this turned out to be a bit messy. Called to change the ticket for 22nd, paid $56x4. Revised ticket showed up on AF and Delta. Few days later got a message that ticket had to be changed again. It was changed to a later flight on 22nd, times just don't work for me. Called yet again, changed the ticket back for 21st.

Few times already saw same level award availability on AF.com, called to change, was told nothing is available.

Question for AF experts - what to do here? Keep checking and calling? Any way to better understand availability or if it's shown on AF site they should be able to book me onto that flight?