Forgot to mention in my earlier post the fact all USA bound flights from DUB's new T2 opening next year will be deemed to be 'domestic' flights.
This is due to the fact all PAX will have cleared USA Immigration, Customs & Dept of Agriculture at DUB.
Presently, arriving flights at MCO from Canada and the Bahamas are treated as 'Domestic' because of the 'pre clearance' facilities at those countries.
As far as I'm aware they do not have to clear TSA Security even if they arrive at Airside 1.
If this is not so, can someone please correct me.