{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "schema:Flight",
  "title": "Flight",
  "description": "An airline flight.",
  "type": "object",
  "allOf": [
    {
      "description": "A trip or journey. An itinerary of visits to one or more places.",
      "$ref": "schema:Trip"
    }
  ],
  "properties": {
    "aircraft": {
      "description": "The kind of aircraft (e.g., \"Boeing 747\").",
      "anyOf": [{ "type": "string" }, { "$ref": "schema:Vehicle" }]
    },
    "arrivalAirport": {
      "description": "The airport where the flight terminates.",
      "$ref": "schema:Airport"
    },
    "arrivalGate": {
      "description": "Identifier of the flight's arrival gate.",
      "oneOf": [
        { "type": "string" },
        { "type": "array", "items": { "type": "string" } }
      ]
    },
    "arrivalTerminal": {
      "description": "Identifier of the flight's arrival terminal.",
      "oneOf": [
        { "type": "string" },
        { "type": "array", "items": { "type": "string" } }
      ]
    },
    "boardingPolicy": {
      "description": "The type of boarding policy used by the airline (e.g. zone-based or group-based).",
      "$ref": "schema:BoardingPolicyType"
    },
    "carrier": {
      "description": "'carrier' is an out-dated term indicating the 'provider' for parcel delivery and flights.",
      "$ref": "schema:Organization"
    },
    "departureAirport": {
      "description": "The airport where the flight originates.",
      "$ref": "schema:Airport"
    },
    "departureGate": {
      "description": "Identifier of the flight's departure gate.",
      "oneOf": [
        { "type": "string" },
        { "type": "array", "items": { "type": "string" } }
      ]
    },
    "departureTerminal": {
      "description": "Identifier of the flight's departure terminal.",
      "oneOf": [
        { "type": "string" },
        { "type": "array", "items": { "type": "string" } }
      ]
    },
    "estimatedFlightDuration": {
      "description": "The estimated time the flight will take.",
      "anyOf": [
        { "type": "string", "$comment": "https://schema.org/Duration" },
        { "type": "string" }
      ]
    },
    "flightDistance": {
      "description": "The distance of the flight.",
      "anyOf": [
        { "type": "string", "$comment": "https://schema.org/Distance" },
        { "type": "string" }
      ]
    },
    "flightNumber": {
      "description": "The unique identifier for a flight including the airline IATA code. For example, if describing United flight 110, where the IATA code for United is 'UA', the flightNumber is 'UA110'.",
      "type": "string"
    },
    "mealService": {
      "description": "Description of the meals that will be provided or available for purchase.",
      "oneOf": [
        { "type": "string" },
        { "type": "array", "items": { "type": "string" } }
      ]
    },
    "seller": {
      "description": "An entity which offers (sells / leases / lends / loans) the services / goods.  A seller may also be a provider.",
      "anyOf": [{ "$ref": "schema:Organization" }, { "$ref": "schema:Person" }]
    },
    "webCheckinTime": {
      "description": "The time when a passenger can check into the flight online.",
      "type": "string",
      "format": "date-time"
    }
  }
}