ATL...AA recently added back the fifth daily; DL is the dominant on this route; its one of MIA's biggest O&D domestic markets (#3 or 4), but I think 5x daily is good
PHL...a 4th daily would not surprise me in the future; especially seeing how LGA, DCA, BWI, BOS, and BDL are all getting new flights this summer
YYZ...it was 3x daily until 04Sep01; what happened? It's a dense route and I was surprised to see the 3rd daily discontinued. Hope to see it back.
YUL...rumours were that they were going to add a 2nd daily before 9.11 happened.
DFW...there recently added a 9th daily and a 10th is coming in June; add that to the 6 dailies from FLL and the Miami-Dallas market is well covered. It is a hub route, though, so more flights would always work.
IAH...they used to have 4x daily, when did the 4th end?
BNA...only 1x daily, that really surprises me. I definitley could see them adding two more.
STL...definitley. Only 4x daily and this is supposed to be a hub route.
DTW...as I am sure you know, it was supposed to go to 3x daily this past December; hopefully it will this coming December. Of all the domestic markets AA serves out of MIA, DTW is definitley the most underserved. They have only ONE of 15 daily flights between Miami and Motown.
SJC...not if, but when. It is coming back, I'm sure of it. I say 12 to 18 months.
SEA...same with SJC; I give it 6-12 months.
PIT...there were some big rumours about PIT happening this fall along with MSP and MCI.
CLT...if US falters, it is a no-brainer.
I think some other POSSIBILITIES include: BHM (Eagle), CMH, IND, LAS, PHX, SAN, AUS, ISP, GSO (Eagle), return of SAV (Eagle)
Of course, not all of these are going to happen, and none are likely soon, but I think they are possibilites for the future.