Which aspect does not require NEPA review?

The correct choice identifies that locally funded items, which do not require Airport Layout Plan (ALP) approval, do not necessitate a National Environmental Policy Act (NEPA) review. NEPA reviews are primarily focused on actions that could significantly affect the quality of the environment, especially those that involve federal funding or federal approvals.

Since the items in question are locally funded and do not require ALP approval, they fall outside the scope of federal action that would trigger NEPA requirements. As a result, these locally funded projects are subject to local regulations and procedures rather than the federal NEPA process.

In contrast, federal grants, such as those provided by AIP (Airport Improvement Program), or actions tied to ALP approvals, typically involve federal decision-making processes and thus require a thorough environmental review to assess any potential impacts. Routine maintenance funded through federal grants and AIP-funded repairs are more likely to have environmental implications and are subject to the NEPA review process as they involve federal oversight and funding.