What is the practice regarding loading the flight plan route prior to receiving ATC clearance?

When preparing for a flight, it is generally discouraged to load the flight plan route prior to receiving ATC clearance. This practice helps to ensure that the route is accurate and reflects any last-minute changes or instructions provided by air traffic control. Loading the route before receiving clearance can lead to confusion, as the pilot may end up following an outdated or incorrect flight plan if ATC issues a different route.

The goal is to maintain clear communication and adherence to ATC instructions, which is critical for flight safety and efficiency. By waiting for clearance, pilots can ensure that they are operating within the framework provided by air traffic control, minimizing the risk of discrepancies between their planned route and the cleared route.