code: function() {
      this.setHelpUrl(Blockly.Msg.VARIABLES_SET_HELPURL);
      this.setColour(330);
      this.appendValueInput('VALUE')
          .appendField(Plane.getMsg('Plane_setSeats'));
      this.setTooltip(Blockly.Msg.VARIABLES_SET_TOOLTIP);
      this.setDeletable(false);
    }
docs: Block seat variable setter.