{
  "name": "United Airlines Booking",
  "description": "Structure of a United Airlines NDC booking (PNR) including passenger, itinerary, and pricing data.",
  "fields": [
    { "name": "bookingId", "type": "string", "required": true, "description": "Unique booking identifier" },
    { "name": "recordLocator", "type": "string", "required": true, "description": "6-character PNR code (e.g., ABCDEF)" },
    { "name": "status", "type": "enum", "required": true, "values": ["confirmed", "held", "cancelled"], "description": "Booking status" },
    {
      "name": "passengers",
      "type": "array",
      "required": true,
      "description": "Passenger details",
      "items": {
        "fields": [
          { "name": "firstName", "type": "string", "required": true },
          { "name": "lastName", "type": "string", "required": true },
          { "name": "type", "type": "enum", "required": true, "values": ["ADT", "CHD", "INF"], "description": "Adult, Child, or Infant" },
          { "name": "dateOfBirth", "type": "date", "required": false },
          { "name": "mileagePlusNumber", "type": "string", "required": false, "description": "MileagePlus loyalty number" },
          { "name": "knownTravelerNumber", "type": "string", "required": false }
        ]
      }
    },
    {
      "name": "itineraries",
      "type": "array",
      "required": true,
      "description": "Outbound and/or return itineraries",
      "items": {
        "fields": [
          { "name": "duration", "type": "string", "required": false, "description": "ISO 8601 duration (e.g., PT4H30M)" },
          {
            "name": "segments",
            "type": "array",
            "required": true,
            "items": {
              "fields": [
                { "name": "flightNumber", "type": "string", "required": true, "description": "e.g., UA523" },
                { "name": "origin", "type": "string", "required": true, "description": "IATA code" },
                { "name": "destination", "type": "string", "required": true, "description": "IATA code" },
                { "name": "departureTime", "type": "datetime", "required": true },
                { "name": "arrivalTime", "type": "datetime", "required": true },
                { "name": "aircraft", "type": "string", "required": false },
                { "name": "operatingCarrier", "type": "string", "required": false, "description": "IATA carrier code" }
              ]
            }
          }
        ]
      }
    },
    {
      "name": "price",
      "type": "object",
      "required": true,
      "fields": [
        { "name": "total", "type": "number", "required": true },
        { "name": "base", "type": "number", "required": false },
        { "name": "taxes", "type": "number", "required": false },
        { "name": "currency", "type": "string", "required": true, "description": "ISO 4217 code, e.g., USD" }
      ]
    },
    { "name": "createdAt", "type": "datetime", "required": false },
    { "name": "expiresAt", "type": "datetime", "required": false, "description": "For held bookings" }
  ]
}