Final answer:
The phrase "cleared as filed" in aviation means that the pilot's flight plan, including route and altitude, has been approved as submitted without changes. It is a true statement.
Step-by-step explanation:
When air traffic control (ATC) states that a flight is "cleared as filed," it means that the pilot's requested flight plan, which includes both the route and the altitude, has been approved without any amendments. This clearance indicates that all the waypoints, airways, and the altitudes that were filed in the flight plan are accepted and the pilot is authorized to follow them after departure. It's essentially an acknowledgment that the flight can proceed as it was originally planned, and is a true statement.