What is it?
In detail: these destinations can then be passed in a Travel Seasonality API request to retrieve seasonality for a given destination. A destination can be either an airport code or a multi-airport city (MAC) code. If a MAC is used as a destination, results will represent all airports belonging to the MAC.
Sabre® creates and maintains in the Sabre cache the list of destination airports that can be used with the Travel Seasonality API. The list represents the most commonly booked destinations.