For those using American Airlines/American Eagle to get to Dominica, the following was posted on the American Airlines website under "Baggage Allowance" for flights to/from Puerto Rico. As we all know, American Eagle is a part of American Airlines. I clicked on American Eagle and looked for luggage restrictions to clarify the maximum weight allowed on the American Eagle leg of the trip.
For flights to/from Puerto Rico and the U.S. Virgin Islands
The maximum amount of baggage each ticketed passenger is allowed free of charge is:
2 pieces checked and one carry-on
Please note that one carry-on personal item (briefcase, small backpack or laptop) does not count toward the free bag allowance.
The size limitation of your luggage is calculated by adding the total outside dimensions of each bag, that is, length + width + height.
TWO checked bags at 62 in/157 cm each
ONE carry-on bag at 45 in/114 cm
The maximum weight PER checked bag is 70 lbs/32 kgs.
The maximum weight PER carry-on bag is 40 lbs/18 kgs.
Everything you need to know about Baggage on AA flights can be read on the following website.
Hope this helps.