How do dispatchers calculate estimated time of arrival (ETA)?

The method of calculating estimated time of arrival (ETA) by computing airspeed, distance, and potential delays is a standard practice in aviation dispatching. This approach allows dispatchers to take into consideration the crucial elements that influence flight duration.

Airspeed is a key factor since it directly impacts how quickly the aircraft will cover a given distance. By knowing the aircraft's cruising speed, dispatchers can project how long it will take to reach the destination. Distance is straightforward; by calculating the miles or nautical miles to the destination, the dispatcher can derive the time needed based on the speed.

Furthermore, potential delays—whether they stem from weather, air traffic, or operational issues—must be factored in to create a more accurate ETA. This nuanced calculation provides a realistic timeframe for when the aircraft is expected to arrive, ensuring better planning and communication with flight crews and ground operations.

While the captain's discretion, estimating fuel loads, and using a standard time for all flights may play roles in the overall flight planning process, they do not specifically capture the methodical approach required to accurately determine ETA under varying conditions.