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    Variable ARTCC_STRATAConst

    ARTCC_STRATA: readonly ["LOW", "HIGH", "UTA", "CTA", "FIR", "CTA/FIR"] = ...

    The full set of ArtccStratum values, in declaration order.

    Use as the single source of truth for value-side iteration over ARTCC stratum kinds (e.g. building a lookup table keyed by stratum) or with isArtccStratum to narrow an external string into the union. The as const satisfies brand keeps this array in sync with the type at compile time.