{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/fleet-catalog/schema/aircraft.schema.json",
  "title": "Airline Fleet Catalog",
  "description": "Standardized schema for tracking airline fleet properties across multiple carriers",
  "type": "object",
  "required": ["schema_version", "airline", "generated_at", "aircraft"],
  "properties": {
    "schema_version": {
      "type": "string",
      "description": "Semantic version of the schema",
      "pattern": "^\\d+\\.\\d+\\.\\d+$"
    },
    "airline": {
      "type": "object",
      "required": ["iata_code", "name"],
      "properties": {
        "iata_code": {
          "type": "string",
          "description": "2-letter IATA airline code",
          "pattern": "^[A-Z0-9]{2}$"
        },
        "icao_code": {
          "type": ["string", "null"],
          "description": "3-letter ICAO airline code",
          "pattern": "^[A-Z]{3}$"
        },
        "name": {
          "type": "string",
          "description": "Full airline name"
        },
        "country": {
          "type": ["string", "null"],
          "description": "ISO 3166-1 alpha-2 country code"
        }
      }
    },
    "generated_at": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when this file was generated"
    },
    "aircraft_count": {
      "type": "integer",
      "description": "Total number of aircraft in this file"
    },
    "aircraft": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/aircraft"
      }
    }
  },
  "$defs": {
    "aircraft": {
      "type": "object",
      "required": ["registration"],
      "properties": {
        "registration": {
          "type": "string",
          "description": "Aircraft registration (tail number) without dashes"
        },
        "icao24": {
          "type": ["string", "null"],
          "description": "24-bit ICAO Mode-S transponder address in hexadecimal"
        },
        "aircraft_type": {
          "$ref": "#/$defs/aircraft_type"
        },
        "operator": {
          "$ref": "#/$defs/operator"
        },
        "cabin": {
          "$ref": "#/$defs/cabin"
        },
        "connectivity": {
          "$ref": "#/$defs/connectivity"
        },
        "ife": {
          "$ref": "#/$defs/ife"
        },
        "status": {
          "type": "string",
          "enum": ["active", "stored", "maintenance", "retired"],
          "description": "Current operational status"
        },
        "tracking": {
          "$ref": "#/$defs/tracking"
        },
        "metadata": {
          "$ref": "#/$defs/metadata"
        },
        "history": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/history_entry"
          }
        }
      }
    },
    "aircraft_type": {
      "type": "object",
      "properties": {
        "iata_code": {
          "type": ["string", "null"],
          "description": "IATA aircraft type code (e.g., 77W, 359)"
        },
        "icao_code": {
          "type": ["string", "null"],
          "description": "ICAO aircraft type designator (e.g., B77W, A359)"
        },
        "manufacturer": {
          "type": ["string", "null"],
          "description": "Aircraft manufacturer (Airbus, Boeing, Embraer, etc.)"
        },
        "model": {
          "type": ["string", "null"],
          "description": "Aircraft model (A350, 777, etc.)"
        },
        "variant": {
          "type": ["string", "null"],
          "description": "Aircraft variant (900, 300ER, etc.)"
        },
        "full_name": {
          "type": ["string", "null"],
          "description": "Full aircraft type name"
        }
      }
    },
    "operator": {
      "type": "object",
      "description": "Operational details specific to this aircraft",
      "properties": {
        "sub_fleet_code": {
          "type": ["string", "null"],
          "description": "Internal sub-fleet code (e.g., AB, CA, AR)"
        },
        "cabin_crew_employer": {
          "type": ["string", "null"],
          "description": "Airline code of cabin crew employer"
        },
        "cockpit_crew_employer": {
          "type": ["string", "null"],
          "description": "Airline code of cockpit crew employer"
        }
      }
    },
    "cabin": {
      "type": "object",
      "properties": {
        "physical_configuration": {
          "type": ["string", "null"],
          "description": "Physical seat configuration code (e.g., J034W024Y266)"
        },
        "operational_configuration": {
          "type": ["string", "null"],
          "description": "Operational/saleable seat configuration"
        },
        "saleable_configuration": {
          "type": ["string", "null"],
          "description": "Saleable seat configuration"
        },
        "total_seats": {
          "type": ["integer", "null"],
          "description": "Total number of passenger seats"
        },
        "classes": {
          "type": "object",
          "properties": {
            "first": {
              "type": "integer",
              "description": "Number of first class seats"
            },
            "business": {
              "type": "integer",
              "description": "Number of business class seats"
            },
            "premium_economy": {
              "type": "integer",
              "description": "Number of premium economy seats"
            },
            "economy": {
              "type": "integer",
              "description": "Number of economy seats"
            }
          }
        },
        "freight_configuration": {
          "type": ["string", "null"],
          "description": "Cargo hold configuration (e.g., PP008LL012)"
        }
      }
    },
    "connectivity": {
      "type": "object",
      "properties": {
        "wifi": {
          "type": "string",
          "enum": ["none", "low-speed", "high-speed"],
          "description": "WiFi availability and speed tier"
        },
        "wifi_provider": {
          "type": ["string", "null"],
          "description": "WiFi service provider (Starlink, Viasat, Gogo 2Ku, etc.)"
        },
        "satellite": {
          "type": ["boolean", "null"],
          "description": "Whether satellite connectivity is available"
        },
        "live_tv": {
          "type": ["boolean", "null"],
          "description": "Whether live TV is available"
        },
        "power_outlets": {
          "type": ["boolean", "null"],
          "description": "Whether AC power outlets are available"
        },
        "usb_ports": {
          "type": ["boolean", "null"],
          "description": "Whether USB charging ports are available"
        }
      }
    },
    "ife": {
      "type": "object",
      "description": "In-flight entertainment system",
      "properties": {
        "type": {
          "type": ["string", "null"],
          "enum": ["none", "overhead", "seatback", "streaming", "hybrid", null],
          "description": "Type of IFE system"
        },
        "personal_screens": {
          "type": ["boolean", "null"],
          "description": "Whether personal seatback screens are available"
        }
      }
    },
    "tracking": {
      "type": "object",
      "description": "Flight tracking statistics",
      "properties": {
        "first_seen": {
          "type": ["string", "null"],
          "format": "date",
          "description": "Date when aircraft was first tracked"
        },
        "last_seen": {
          "type": ["string", "null"],
          "format": "date",
          "description": "Date when aircraft was last tracked"
        },
        "total_flights": {
          "type": ["integer", "null"],
          "description": "Total number of flights tracked"
        }
      }
    },
    "metadata": {
      "type": "object",
      "description": "Additional metadata about the aircraft",
      "properties": {
        "delivery_date": {
          "type": ["string", "null"],
          "format": "date",
          "description": "Date aircraft was delivered to airline"
        },
        "msn": {
          "type": ["string", "null"],
          "description": "Manufacturer Serial Number"
        },
        "line_number": {
          "type": ["string", "null"],
          "description": "Production line number"
        },
        "production_site": {
          "type": ["string", "null"],
          "description": "Factory/production site (e.g., Toulouse, Hamburg, Mirabel)"
        },
        "engine_type": {
          "type": ["string", "null"],
          "description": "Engine model (e.g., Trent XWB-84, GE90-115B)"
        },
        "aircraft_name": {
          "type": ["string", "null"],
          "description": "Aircraft given name (e.g., 'Fort-de-France')"
        },
        "livery": {
          "type": ["string", "null"],
          "description": "Special livery or paint scheme"
        },
        "comments": {
          "type": ["string", "null"],
          "description": "Additional notes or comments"
        },
        "created_at": {
          "type": ["string", "null"],
          "format": "date-time"
        },
        "updated_at": {
          "type": ["string", "null"],
          "format": "date-time"
        }
      }
    },
    "history_entry": {
      "type": "object",
      "required": ["timestamp", "property"],
      "properties": {
        "timestamp": {
          "type": "string",
          "description": "Date or datetime when change was detected"
        },
        "property": {
          "type": "string",
          "description": "Dot-notation path to the changed property"
        },
        "old_value": {
          "description": "Previous value"
        },
        "new_value": {
          "description": "New value"
        },
        "source": {
          "type": ["string", "null"],
          "enum": ["flight_api", "airline_api", "manual", "planespotters", "community", null],
          "description": "Source of the change detection"
        }
      }
    }
  }
}