American Airlines Flight 1179 today April 20

Anyone know what was going on with AA1179 from Boston to O’Hare tonight? It got just East of the airport(ORD) and circled many times before being routed to Rockford of all places. If it had a problem why not keep going to ORD or even MKE? I see that after landing at Rockford its headed back to O’Hare as I type.

Rockford is a standard diversion airport from ORD due to the fact that it is west of Chicago so the weather has usually cleared it and the fact that it has long wide runways, a passenger terminal, customs, tall airstairs, and a big ramp.