So, a couple of thoughts, but the above is 100% correct.

Pre-clearance at DUB: Between Oct and June, or possibly only March if they finish early, there will be no lounge past Pre-Clearance at DUB T2. There has been no word from AA as to what they’ll do.

At DUB, the boarding past may not say “Fast Track”, but AA Business does get Fast Track, which is to the left at the top of the escalators. Use it! Pre-clearance will accept you starting about 2+30 before departure (indicated on the screens), and beyond that the AA flight usually leaves from 404 or 406, and has limited seats in the area.

At DFW, as noted above, from DUB you walk off the plane directly airside. Then you can use the inter-terminal rail connection (Skylink) to get anywhere quickly, although the ride is bumpy. The nearest Skylink station is indicated on the ceiling signs throughout all terminals, leading you to the escalators and lifts. Walking between terminals is a mugs game, as the people movers are in poor repair.

Qantas will leave from Terminal D, so after arriving (at probably Terminal A), just nip over to Terminal D and go to Gate 23 for the Flagship Lounge/Admirals Club…the Flagship is the superior choice.