Congrats on your upcoming nuptials imarks

You only have 16 flights, and 1 south america flight. So scope to include some of your south america travels on this ticket.

2 of 5 possible F seats (let alone wanting discounted F booking class A) on a single flight SCL-AKL-SYD will be near impossible.

Isn't August a busy travel period for Japan? Depending on the dates it may be difficult to get availability.

No first class on many of the flights, but all the really long ones seem to have first.