What does the term "bank" refer to in aviation?

In aviation, the term "bank" specifically refers to a maneuver in which an aircraft tilts or leans to one side during a turn. This banking action allows the airplane to change direction effectively while maintaining lift. When an aircraft banks, the lift vector is tilted, which creates a horizontal component that helps to turn the plane. Proper banking is essential for executing smooth turns at various altitudes and speeds, ensuring passenger safety and comfort.

Understanding this concept is vital for flight attendants, as they need to be aware of the aircraft's movements to ensure passenger safety during maneuvers like turns. The other options do not accurately represent the significance of the term "bank" in aviation. For instance, cargo storage methods do not relate to the aircraft's movement, while the angle of descent during landing pertains to a different aspect of flight dynamics. Lastly, air traffic levels deal with the management of aircraft in controlled airspace rather than a specific maneuver executed by the airplane itself.