export declare class Constants {
    static readonly EXECUTIVE = "EX";
    static readonly ECONOMIC = "EC";
    static readonly BAD_REQUEST = "bad_request";
    static readonly EMPTY_SEARCH = "empty_search";
    static readonly ERROR = "error";
    static readonly INTERNAL_ERROR = "internal_error";
    static readonly ROUND_TRIP = "RT";
    static readonly ONE_WAY = "OW";
}