A cat 3 approach to the vis they were requires a go around if loc and gs parameters are not met. Autopilot and autoland is required. Handflying to a landing is not allowed. An RJ took off when AA was on a 2 mile final so can't see how the loc and gs signal was protected as required for their approach. AC are required to hold short before the end of the runway short of the gs antenna if cat 3 approaches are in progress. Lots of blame to be passed out on this one.