After evaluating all of the options, the airline tickets were purchased this weekend. The prices for the return ticket were holding steady, but we finally saw a little drop in the outbound flight by departing for Miami on Thursday night instead of Friday morning, saving $600. (less the hotel expense.)
We decided not to purchase slightly less expensive tickets via an on-line travel service as they were routing us on multiple airlines wich could create complications if the airlines change flight schedules and the potential for additional baggage fees.
At the time the tickets were purchased, my remaining "gold" status said that we would be allowed 2 free bags per person. We will need to wait & see if that holds true for the trip.
It seems that American Airlines no longer offers flights into TCB, so we will get to see the new & improved airport & runway at Marsh Harbor.