This is the 10279th most frequent Russian word.
борт
The Russian word "борт" translates to "board" or "side" (e.g., of a ship, aircraft, or vehicle).
Here, 'борт' refers to the side or surface of the ship.
Капитан приказал матросам очистить борт корабля.
The captain ordered the sailors to clean the side of the ship.
In this context, 'борт' could be implied to represent the bound area within the airplane, as commonly associated with being 'on board'.
Самолет взлетел и исчез из виду, пропадая за облаками.
The airplane took off and disappeared from view, vanishing behind the clouds.
Here, 'борт' means being aboard or on the structure of the vehicle, often maritime or aeronautical.