Gela, We always fly American and also with our Advantage miles and there are no perks. The only time that(a perk) happeded was when we were stranded once, because of snow and they then did put us up in a Hotel, on them! It won't be a perk if you have to overnight in another city, on your way. We will be flying to Belize, with American and will have to overnight on the way home, in Dallas, and the cheapest rate we found was $715, total with taxes etc. We only had enough "advantage miles" for one ticket this time.
I might add, we fly from NY..(not the city) and the cost may differ with the distance. Plus, we have to pay for our own room in Dallas.
Scuba lady may have somewhat of an advantage for purchasing many tickets at one time for those that she takes for tours. I don't know.
But I do know it takes 35,000 miles for a ticket to Belize. That is a $35,000 in purchases on your citibank Master Card. Hope this helps.