Getting ready 

In this recipe, we will be reading a tab-delimited (or comma-delimited) file, so please ensure that you have a text (or CSV) file available. For your convenience, you can download the airport-codes-na.txt and departuredelays.csv files from https://github.com/drabastomek/learningPySpark/tree/master/Chapter03/flight-data. Ensure your local Spark cluster can access this file (for example, ~/data/flights/airport-codes-na.txt).