My PiAware setup is showing American Airlines flight, AAL2007, is having a problem. Found it when they squawked 7600 on their transponder.
The flight was bound for Pensacola, FL, but as of 0955 the Airbus A321 is holding at 7100 feet in a racetrack pattern west of Charlotte. This is likely to work checklists and burn off fuel to reach a safe landing weight before returning to Charlotte. Don't know what the issue is. If I had time I'd fire up one of my SDRs and listen in on the approach frequency for Charlotte.