hello friends, I‘d like to give you some periodic update for my *current* changes as you helped me a lot. I ended up paying $125 USD to change my EZE-MIA-YYZ to EZE-JFK then LGA-YYZ because no D class was available for my initial route at the dates I need. So that's a transit point change and I'm fine to be charged. I also made date changes of all the dummy bookings for later this year. confirmed with twitter team that $125 only applies to the transit point change but not on all the other date changes. Glad to know at least QF twitter people still carry the fare rules. But still, I will definitely plan out the itinerary and call AA to book it manually next time. thank you!