Tried JAX-RDU looking more convoluted indeed
, although distinctly short of Instant Upgrade options. (tried Mar 16/18). Also if searching for First/Business, the issue below also comes up.
Here's another weird/interesting anomaly:
LAS-NYC 13 Mar / 18 Mar. (searching Business/First)
AA258 is offered as "Instant Upgrade" / "Business Flexible" / "First Flexible" on the AU site.
On the US site, it is offered as "Instant Upgrade" / no J flex / "First Flexible"
Seeing it's a 757 direct flight, should there be a J base fare offered? I realise one is filed between LAS and NYC, but the AA (US) site ignores it unless the Transcon LAX-JFK 3 class flights are offered.
Also the Instant Upgrade fares look weird. $A823 available on both direct flights each way, $A1300ish available on all other flights. US site is $US569++ on most fares each way. First Flexible fares look about right converted.
Quite happy to see the likes of BNE-SFO turn up to give another option when pricing trips to the US.