Why the Fleet Air Arm was not built around a battle line

How did the Fleet Air Arm plan to help battleships in a Second World War line of battle?

Through scouting and strikes, but the Royal Navy expected mobile operations and convoy battles rather than making a traditional battle line its main planning case.

Aircraft could spot for battleships and strike enemy ships, but the Royal Navy did not treat a formal line of battle as the likely center of a new war. Its planning emphasized mobile, dispersed operations rather than protecting a First World War-style battle line. Cape Matapan, the Bismarck pursuit, and Operation Pedestal are better models for how carriers and surface forces would cooperate. This distinction separates a residual capability from the operational case around which a service actually organizes.