When flying between Brazil and Europe (via same-day connections in MIA), since the start of 2016, it has again been possible to check bags straight through to their final destination - with no need to collect them at this particular connecting US airport.

In those cases, AA check-in staff would apply red ITI tags to the bags, to prevent them from being put on the collection belt with domestic-bound luggage from the inbound flight.

This is a real convenience, and allows for better use of my connection time - at the beach, rather than waiting to needlessly collect bags.

HOWEVER - next month, I'll be making a similar trip, but will be checking in with QR (DOH-MAD), from whom I'm connecting to AA (MAD-MIA-GIG) on a separate ticket. While I'm reasonably comfortable that I'll be able to get QR to check the bags through to Rio, I'm less certain how they'll be treated in MIA - since QR probably doesn't have those red "ITI" tags.

Does anyone here have any experience with how ITI baggage works in MIA in such a case? Is the "International to International" nature of my AA to AA connection sufficient for the bags to be transferred directly? Or will the absence of that red tag force me to wait around to manually schlep my bags from one conveyor belt to another?

Worst case would be if I were told I had to wait around, only to find that the bags were automatically transferred after all...