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    Variable AIRWAY_TYPESConst

    AIRWAY_TYPES: readonly [
        "VICTOR",
        "JET",
        "RNAV_Q",
        "RNAV_T",
        "GREEN",
        "RED",
        "AMBER",
        "BLUE",
        "ATLANTIC",
        "BAHAMA",
        "PACIFIC",
        "PUERTO_RICO",
    ] = ...

    The full set of AirwayType values, in declaration order.

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