Before publishing your model as a web service, create a scoring experiment and make sure that the Web service input and the Web service output modules are properly connected. Also, process the model if you want your output in a proper format, for example, outputting only the scored label and input to the score model may not contain the label column; in this case, you can also filter the ArrDelay15 column along with the others in the Project Columns module connected to the Score Model module. Let's take a look at the following screenshot:

Then, publish your scoring experiment, so that it would be available as a web service in the staging environment. Test your web service visually and also with Excel. If you are good at programming, you're encouraged to test your web service by writing a small client program as well.