My wife got one of those a few months ago. She followed up on it, and the result was an invitation to a meeting that was held in an empty commercial space in a strip mall not far from here. We were asked to fill out a questionnaire, and then escorted to a waiting area to watch a video about a resort in the Bahamas with a number of other couples (there were no singles in the crowd).
After a few minutes, my wife and I were taken to a smaller office where a sales person explained that we were not 'suitable' for the main promotional deal, but as a consolation prize, we were being awarded round trip tickets on any major airline. The 'gotcha' was that there was a hefty processing charge for taking the deal - which was more than the cost of a pair of tickets on Southwest to the destination we probably would have chosen for our trip. No sale!
I noticed that several other couples were also invited out of the waiting area, and while this is only my visual observation, the one thing that they all appeared to have in common was age - the people who appeared to be awarded the consolation prize were all older.
My suspicion is that the primary objective was to use the invitation to screen for potential purchasers of time share properties in the Bahamas.
So is it a scam? Not sure - depends on how you define 'scam'. But it's certainly a racket.