The behavior you described, with passengers standing up and crowding the aisles before the aircraft has come to a complete stop and the doors have been opened, is often referred to as “gate lice” or “gate crowding.” It can be frustrating and lead to unnecessary congestion. Here are a few reasons why this behavior occurs:

1. Impatience: Passengers may be eager to disembark quickly to catch connecting flights, make other transportation arrangements, or simply get off the plane after a long journey. Impatience can lead them to stand up and gather their belongings before it is necessary.
2. Perception of Time: Passengers may believe that standing up and getting ready to disembark will expedite the process. They may think they will be the first ones off the plane, even though the actual order of disembarkation is typically organized by the airline and cabin crew.
3. Limited Overhead Bin Space: Some passengers may be concerned about limited overhead bin space and want to ensure they can retrieve their belongings easily. They may think that by standing up early, they can secure their belongings without any issues.
4. Lack of Awareness or Information: Some passengers may not be aware of the proper etiquette and procedures for disembarking. They may not realize that standing up and crowding the aisles can create delays and inconvenience for others.

It’s important to note that this behavior does not actually expedite the disembarkation process. In fact, it can slow down the overall process as passengers in the aisles block the path for others who are trying to exit their seats. Flight attendants often make announcements reminding passengers to remain seated until the aircraft has come to a complete stop and the doors have been opened.

To ensure a smooth and efficient disembarkation process, it is recommended that passengers follow the instructions and guidance of the cabin crew, remain seated until it is their turn to exit, and only gather their belongings when it is safe to do so. This helps maintain order, prevent unnecessary congestion, and ensure the safety of all passengers.