Booking flights to Samana?

[JC171]

My friends are trying to book flights to Samana from The USA but flights dont appear on sights such as expedia and travelocity or AA site?they try using samana as destination or airport code AZS
is there something wrong?are they using wrong airport code or city name?

 

[Jasper]

go to american airlines and type in samana as destination city. via puerto rico.