code: function( options, callback ) {
      options = Object.assign({ type: 'firstflightin', verb: '/arriving_before/' }, options )
      return this.connections( options, callback )
    }
docs: Get the first inbound flight between two airports
  @param {Object} options - see [.connections()]{@link FlightStats#connections}
  @param {Function} callback
  @return {Request}