It’s already bookable on AA.com. However, it only begins on 19th November and only operates 4x weekly. MIA-BSB operates WeFrSaSu and BSB-MIA operates on MoThSaSu. If you choose travel dates on these days, the flights will be shown. Unfortunately AA’s archaic website simply says there are no flights if you choose a date with no flights, without any helpful explanation or suggesting alternative dates.
Ryan / HKG