eFIDS uses near real time data to track active flights. This information can be used to update ETA of a flight in progress, as well as to determine when a flight has arrived or departed. In the event that the data feed becomes unavailable, airport and airline staff are notified via email and via an audible alert on the eFIDS admin webpage. During this time, the system maintains all displays in their last updated form. Authorized airport and airline personnel can use their PC workstations or a phone to make updates. When manual updates are made, the changes are propagated to all appropriate eFIDS displays. When the data feed is restored, updates will automatically resume.