I am booking a one-way from HKG to MIA. Google Flights found a Premium Economy fare (AA tickets and metal) for 9,742(HKD) which at the moment is approximately 1240.98(USD). Clicking through in Google Flights redirects to "bookaa.amadeus.com/..." which is an AA booking page, where I can purchase the tickets in HKD. The same itinerary booked at AA.com prices at over $2000 USD.

So my question is, what is going to happen if I book the itinerary in HKD through what appears to be the Hong Kong locale AA website? My AAdvantage account and credit card are all US based if that matters.