Question about a switch statement inside a for in loop

Okay so in a tutorial that I was watching there was these lines of code:

let airportCodes = ["LGA", "LHR", "CDG", "HKG", "DXB"]

for airportCode in airportCodes { switch airportCode { case "LGA": print("New York") case "LHR": print("London") case "CDG": print("Paris") case "HKG": print("Hong Kong") default: print("I don't know which city this airport is in!") } }

I understand that the for in loop runs every value in the array through airportCode and that is why every city gets printed. However, I don't understand why the default is printed as well. If none of the other options are found to be true, then the default should be printed. In this case though, every value of the array is run and at least one is found to be true so why is the default statement still being printed?