Following up on an earlier query
We are still waitlisted for a miles + copay upgrade from LAX-LHR on August 6. Expert mode shows the same fare availability as it did several weeks ago, but the website now no longer allows waitlisting for an upgrade. For both cash and awards upgrades it says "on line upgrade not available."
Can anybody explain what that might mean -- i.e., for the chances of an upgrade (if indeed it implies anything at all)?