Starbase 524 was a Federation Starfleet starbase in operation in the 24th century.
The starbase was assigned with one of the first 15 aeroshuttles, AS-511, as part of its complement of embarked craft.
In the year 2379, stardate 56734.21, AS-511's status was classified, although its mission was not. (Star Trek: The Magazine Volume 3 Issue 12: "DS9 10th anniversary collectors issue")