Just tried visiting today on an AA FF transcon. Can confirm that they no longer accept these tickets as valid for entry. I spoke with an agent who seemed highly competent and not at all power tripping. She informed that AA has specifically directed them to stop accepting transcon F tickets as they do not want to pay anymore (which seems consistent with AA preparing to jettison F altogether). She proactively acknowledged that the oneworld website suggests that there is access, but stated that that is in fact inaccurate. IMHO I am very inclined to believe that transcon F will no longer get access anymore.