code: function( options, callback ) {
  
      var self = this
      var url = '/flightstatus/rest/v2/json/flightsNear/' +
        options.lat + '/' + options.lng + '/' + options.radius
  
      var extensions = []
  
      if( Array.isArray( options.extendedOptions ) ) {
        extensions = extensions.concat( options.extendedOptions )
      }
  
      return this._clientRequest({
        url: url,
        extendedOptions: extensions,
        qs: {
          sourceType: options.sourceType, // raw|derived|all
          maxFlights: options.maxFlights,
        }
      }, function( error, data ) {
        callback.call( self, error, data )
      })
  
    }
docs: Get flights near a given (lat,lng) coordinate, within a radius
  @param {Object} options
  @param {Number} options.lat
  @param {Number} options.lng
  @param {Number} options.radius
  @param {Array<String>} [options.extendedOptions]
  @param {Function} callback
  @return {Request}