{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/united-airlines/main/json-schema/united-airlines-flight-status-schema.json",
  "title": "United Airlines Flight Status",
  "description": "Schema representing the real-time status of a United Airlines flight.",
  "type": "object",
  "properties": {
    "flightNumber": {
      "type": "string",
      "description": "United Airlines flight number",
      "examples": ["UA523"]
    },
    "date": {
      "type": "string",
      "format": "date",
      "description": "Scheduled flight date"
    },
    "status": {
      "type": "string",
      "enum": ["OnTime", "Delayed", "Cancelled", "Diverted", "Landed"],
      "description": "Current flight status"
    },
    "origin": {
      "type": "string",
      "description": "IATA origin airport code",
      "pattern": "^[A-Z]{3}$"
    },
    "destination": {
      "type": "string",
      "description": "IATA destination airport code",
      "pattern": "^[A-Z]{3}$"
    },
    "scheduledDeparture": {
      "type": "string",
      "format": "date-time",
      "description": "Originally scheduled departure time"
    },
    "estimatedDeparture": {
      "type": "string",
      "format": "date-time",
      "description": "Current estimated departure time"
    },
    "actualDeparture": {
      "type": ["string", "null"],
      "format": "date-time",
      "description": "Actual departure time (null if not yet departed)"
    },
    "scheduledArrival": {
      "type": "string",
      "format": "date-time",
      "description": "Originally scheduled arrival time"
    },
    "estimatedArrival": {
      "type": "string",
      "format": "date-time",
      "description": "Current estimated arrival time"
    },
    "actualArrival": {
      "type": ["string", "null"],
      "format": "date-time",
      "description": "Actual arrival time (null if not yet arrived)"
    },
    "departureGate": {
      "type": "string",
      "description": "Departure gate assignment"
    },
    "arrivalGate": {
      "type": "string",
      "description": "Arrival gate assignment"
    },
    "delayMinutes": {
      "type": "integer",
      "minimum": 0,
      "description": "Current delay in minutes (0 if on time)"
    }
  },
  "required": ["flightNumber", "date", "status", "origin", "destination"]
}