In the context of aviation and aerospace, "Arrival Delay" refers to the difference between an aircraft's scheduled arrival time and its actual arrival time. It is a measure of the delay experienced by an aircraft in reaching its destination.

Arrival delay is typically measured in minutes and is calculated as the difference between the scheduled arrival time and the actual arrival time. For example, if an aircraft was scheduled to arrive at 10:00 AM but actually arrived at 10:15 AM, the arrival delay would be 15 minutes.

There are several factors that can contribute to arrival delays, including:

1. Air traffic control congestion
2. Weather conditions
3. Aircraft mechanical issues
4. Crew availability
5. Passenger and cargo loading/unloading issues
6. Ground handling delays

Arrival delays can have significant impacts on the aviation industry, including:

1. Disruption of passenger travel plans
2. Increased costs for airlines and airports
3. Reduced efficiency and productivity
4. Negative impacts on airline and airport reputation

To mitigate arrival delays, airlines, airports, and air traffic control organizations use various strategies, such as:

1. Implementing more efficient air traffic control procedures
2. Investing in advanced technology to improve flight planning and scheduling
3. Enhancing ground handling and passenger processing procedures
4. Providing real-time information to passengers and stakeholders
5. Developing contingency plans to manage delays and disruptions.

In aerospace, arrival delay can also refer to the delay in the arrival of a spacecraft or satellite at its destination, such as a planet or orbit. This can be due to various factors, including propulsion system issues, navigation errors, or gravitational influences.