It's possible at DFW, I've done separate tickets with CX-AA on TPE-HKG-DFW-YYZ and while there was no ITI tag, the baggage ended up in YYZ with no problem. Initially I was worried so I kept checking on aa.com and eventually it gets loaded to the final Int'l flight (around boarding time).

Unfortunately I can't confirm for MIA, but I think in general the bar code is more important than the color tag itself as the bags get automatically sorted at the US arrival airport, whether it goes to baggage claim or next connecting flight gate.