airports = pixiedust.sampleData("https://github.com/DTAIEB/Thoughtful-Data-Science/raw/master/chapter%209/USFlightsAnalysis/airports.csv")
airlines = pixiedust.sampleData("https://github.com/DTAIEB/Thoughtful-Data-Science/raw/master/chapter%209/USFlightsAnalysis/airlines.csv")
flights = pixiedust.sampleData("https://github.com/DTAIEB/Thoughtful-Data-Science/raw/master/chapter%209/USFlightsAnalysis/flights.zip")
