import type { UnitOptions } from "./units.js";
/**
 * Represents an ICAO (International Civil Aviation Organization) identifier,
 * typically used for airports, navigation aids, or weather stations.
 *
 * @type {string}
 */
export type ICAO = string;
/**
 * Standard atmospheric pressure at sea level in hectopascals (hPa).
 *
 * @constant {number}
 */
export declare const ISA_STANDARD_PRESSURE_HPA = 1013.25;
/**
 * Standard atmospheric temperature at sea level in degrees Celsius (°C).
 *
 * @constant {number}
 */
export declare const ISA_STANDARD_TEMPERATURE_CELSIUS = 15;
/**
 * Standard temperature lapse rate in the troposphere in degrees Celsius per meter (°C/m).
 *
 * @constant {number}
 */
export declare const ISA_STANDARD_TEMPERATURE_LAPSE_RATE = 0.0065;
/**
 * Default unit settings used throughout the application when specific units aren't provided.
 * Uses nautical miles for distance, knots for speed, feet for altitude, Celsius for temperature,
 * hectopascals for pressure, kilograms for weight, liters for volume, and degrees for angles.
 *
 * @constant {UnitOptions}
 */
export declare const DefaultUnits: UnitOptions;
/**
 * Maximum recommended duration for a single flight leg in minutes.
 * Used by the advisor to issue a warning for potentially fatiguing legs.
 *
 * @constant {number}
 */
export declare const MAX_LEG_DURATION_MINUTES = 120;