AA 730 TODAY - CLT-LHR had an inbound aircraft that arrived as FCO-CLT - arrived at 4:56PM

For Thursday (tomorrow) the inbound is showing as FRA-CLT arriving at 2:30PM
For Friday the inbound is showing at PRESENT as LHR-CLT arriving at 6PM - It's trending in 30-45 min early the last week or so (5:15-5:30PM or so)

That Friday inbound is NOT a delay the scheduled time for the inbound is a 2:05 PM SCHEDULED departure from London and a 6PM arrival into CLT - it's not delayed - is it as scheduled. Between now and Friday a lot can change from an ops point of view. Look at the app Thursday afternoon and you may see the inbound has switched again. You're reading too much into it for more than 36 hours out.