In the context of aviation and aerospace, "Actual Landing Time Calculated" (ALTC) refers to a calculated estimate of the time at which an aircraft is expected to land, taking into account various factors such as the aircraft's flight plan, air traffic control clearances, weather conditions, and the aircraft's current flight trajectory.

ALTC is typically used by air traffic controllers, airlines, and other aviation stakeholders to plan and manage the arrival and departure of aircraft at airports. It provides a more accurate estimate of the aircraft's landing time than other estimates, such as the "Estimated Time of Arrival" (ETA), which is based on the aircraft's flight plan and may not take into account real-time factors that can affect the flight.

The Actual Landing Time Calculated is usually calculated using a combination of data sources, including:

1. Flight plan data: The aircraft's planned route, altitude, and speed.
2. Air traffic control data:Clearances and instructions issued by air traffic controllers.
3. Weather data: Real-time weather conditions, such as wind, precipitation, and air density.
4. Aircraft performance data: The aircraft's current speed, altitude, and heading.
5. Radar data: The aircraft's current position and trajectory.

By using these data sources, ALTC provides a more precise estimate of the aircraft's landing time, which can help to:

1. Improve air traffic control efficiency: By having a more accurate estimate of landing times, air traffic controllers can better manage the flow of aircraft and reduce congestion.
2. Enhance airline operations: Airlines can use ALTC to plan and manage their arrival and departure schedules more effectively.
3. Increase passenger satisfaction: By providing more accurate estimates of landing times, airlines can better manage passenger expectations and reduce delays.

Overall, the Actual Landing Time Calculated is an important tool in the aviation industry, as it helps to improve the efficiency and safety of air traffic operations, while also enhancing the passenger experience.