Are you asking about 6/8 (the subject line) or 6/9 (from your post text)?

So far on 6/9, only two DFW-MIA flights have been cancelled. AA 1042 and AA 2567. Both were cancelled due to previous ATC issues. The rest are all scheduled to operate but have no availability as of when I checked at 0643 ET.

DFW 500A C24
MIA 25 D39 856A
1DFW/FX CANCEL DFW -MIA -XEA-CXLD DUE TO A PREVIOUS AIR TRAFFIC CXLD-I*2053
7DFW/AUTO REACCOM CXL FLT COMPLETED *2110*CRCYMGComments:

DFW 600A C C4
MIA 22 D11 957A
1DFW/FX CANCEL DFW -MIA -XEA-CXLD DUE TO A PREVIOUS AIR TRAFFIC CXLD-I*2119
7DFW/AUTO REACCOM CXL FLT COMPLETED *2149*CRCYMG

Also, assuming 6/9, I see no availability on AA from DFW to PEI for several days. I found one seat tomorrow, but you'd need to fly to FLL and then get yourself to MIA. BOG is also booked solid. CLO has seats out of JFK, but flights to all three NYC airports are pretty booked as well. I was unable to find any with four seats available Thursday or Friday when I looked just now. There are some Saturday if you connect in MIA or fly into EWR and then connect out of JFK.