code: function( options, callback ) {
  
      var self = this
      var url = '/ratings/rest/v1/json/flight/' + options.carrier + '/' + options.flightNumber
  
      var extensions = []
  
      if( Array.isArray( options.extendedOptions ) ) {
        extensions = extensions.concat( options.extendedOptions )
      }
  
      return this._clientRequest({
        url: url,
        extendedOptions: extensions,
        qs: {
          departureAirport: options.departureAirport,
          codeType: options.codeType,
        }
      }, function( error, data ) {
        callback.call( self, error, data )
      })
  
    }
docs: Get ratings for a specified flight
  @param {Object} options
  @param {String} options.carrier
  @param {String|Number} options.flightNumber
  @param {Array<String>} [options.extendedOptions]
  @param {Function} callback
  @return {Request}