Since MIA is an American hub I hoped those on this forum wold have these answers. I usually only transit MIA so never worried about these things.

When departing MIA, are there porters readily available to take my three large checked bags from the hotel shuttle to AA First class check in? If not, how far would the walk be? And, if I took a taxi is it much easier to get a porter to take bags to AA First class check in counter? I cannot check in outside for an international flight, correct?

When arriving MIA on a domestic flight, will there be a porter available to take my bags from the luggage carousel to the hotel shuttle stop?