Does the American reduction indicate that BA are preparing to take over the services to JFK and ORD?
I doubt it too. On the other hand BA is pushing its customers onto the AA flights under a marketing code share. The lousy AA offering from the regions must be attracting some negative feedback by now from loyal BA customers. They are probably even losing some customers to the better quality VS and TCX nonstop competition at least in the busy summer months when both are offering daily, or close to daily, flights.
At some point surely BA have to sit up and take notice and do something to fix it ? Or maybe not....
Some regulars will go via LHR but by no means all.