code: function( options, callback ) {
  
      debug( 'schedule', options )
  
      var self = this
  
      var protocol = options.protocol || 'rest'
      var format = options.format || 'json'
      var baseUrl = 'schedules/' + protocol + '/v1/' + format + '/flight'
  
      var carrier = options.airlineCode
      var flightNumber = options.flightNumber
      var year = options.date.getFullYear()
      var month = options.date.getMonth() + 1
      var day = options.date.getDate()
      var direction = /^dep/i.test( options.direction ) ?
        'departing' : 'arriving'
  
      var extensions = [
        'includeDirects',
        'includeCargo',
        'useInlinedReferences'
      ]
  
      if( Array.isArray( options.extendedOptions ) ) {
        extensions = extensions.concat( options.extendedOptions )
      }
  
      return this._clientRequest({
        url: baseUrl + '/' + carrier + '/' + flightNumber + '/' + direction + '/' + year + '/' + month + '/' + day,
        extendedOptions: extensions,
      }, function( error, data ) {
  
        if( data != null ) {
          data = FlightStats.formatSchedule( data )
          if( options.airport && data.flights ) {
            data.flights = FlightStats.filterByAirport( data.flights, options.airport, options.direction )
          }
        }
  
        callback.call( self, error, data )
  
      })
  
    }
docs: Get a flight's schedule status information
  @param {Object} options - see [.lookup()]{@link FlightStats#lookup}
  @param {Function} callback
  @return {Request}