Originally Posted by
SJCFlyerLG
And for some reason, I get sent to the Dominican Republic site (aa.com/homepage.do) even though I have North America and United States selected.
I believe the .do has nothing to do with the Dominican Republic in this context, it's a common extension for web pages implemented using Apache Struts or other Java technologies:
https://en.wikipedia.org/wiki/Apache_Struts