How is CELL defined in the context of air refueling?

In the context of air refueling, CELL refers to a tactical formation where two or more tankers operate together in close proximity to facilitate refueling missions. This setup enhances operational efficiency and safety, allowing for streamlined communication and fuel transfer processes. When tankers fly in formation, they can also provide mutual support, manage airspace more effectively, and ensure that receiving aircraft have multiple refueling options, improving their overall mission capability.

The other choices do not capture the specific definition of CELL as it relates to air refueling. The distance between two aircraft is relevant to operational safety but does not define the CELL concept. Maximum fuel capacity of a tanker pertains to volume and logistics rather than the tactical grouping used for refueling. A sequence of aerial maneuvers describes a different context entirely, focusing on flight patterns rather than the cooperative effort involved in the CELL definition.