Aviation System Performance Metrics (ASPM) is an FAA database of the National Airspace System, a part of FAA Operations & Performance Data.
Airport data give airport capacity and throughput for every 15 minutes, and individual flight data give each airport's individual flight's scheduled and actual gate departure time, runway departure time, runway arrival time and gate arrival time, etc.
ASPM is more comprehensive than BTS database maintained by Department Of Transportation(DOT).
A login is required and can be requested with a legitimate reason.
Once a user has a login, he can access ASPM data through GUI or download raw data in DBF format.