Yes, it has been discussed on FT
$400+ is not an amazing deal to the Caribbean, especially on a low cost carrier who will leave you in a world of hurt if your plane is out of service or delayed.
This deal when first announced was for $180/RT give or take.
I also believe AA has cut some of their fares in response. For instance, you can get a RT on AA exNYC to FDF for approx $300 (less than $300 in December, approx $300 in January, etc.)
So please, do a little research before posting "AMAZING" duplicate deals.