density_airlines.py

# List of five airlines to plot
airlines = ['United Air Lines Inc.', 'JetBlue Airways', 'ExpressJet Airlines Inc.'',
         'Delta Air Lines Inc.', 'American Airlines Inc.']

# Iterate through the five airlines
for airline in airlines:
    # Subset to the airline
    subset = flights[flights['name'] == airline]
    
    # Draw the density plot
    sns.distplot(subset['arr_delay'], hist = False, kde = True,
                 kde_kws = {'linewidth': 3},
                 label = airline)
    
# Plot formatting
plt.legend(prop={'size': 16}, title = 'Airline')
plt.title('Density Plot with Multiple Airlines')
plt.xlabel('Delay (min)')
plt.ylabel('Density')

there's a slight typo

- airlines = ['United Air Lines Inc.', 'JetBlue Airways', 'ExpressJet Airlines Inc.'',
+ airlines = ['United Air Lines Inc.', 'JetBlue Airways', 'ExpressJet Airlines Inc.',