Phoenix Sky Harbor International Airport is served by 23 airlines which provide nonstop service from Phoenix to 89 cities in the United States and 17 cities in Canada, Mexico and Europe. Phoenix Sky Harbor International Airport has three terminals, which are numbered 2, 3 and 4, since Terminal was torn down in 1990. The airport administration states that the designation Terminal 1 has been "retired," similar to the number of a famous athlete, and that it did not wish to renumber all the other terminals since passengers were already familiar with the numbers in place.Wireless internet service is available free of charge to all Sky Harbor visitors on both sides on security. You also have access to wirelss internet in retail areas and near the gates at the airport. If a passenger’s laptop computer or wireless electronic device is configured to operate in a wireless mode, it will automatically connect to the internet when powered up near the shops and gates at Sky Harbor.