What is airport code phi?

PHI is not a recognized airport code. It is possible that it could be a shortened form of the code for Philadelphia International Airport (PHL), which is a major airport in Philadelphia, Pennsylvania, United States. The airport code for PHL is recognized by the International Air Transport Association (IATA) and is used by airlines and travelers to identify the airport. PHL is located about 12 miles southwest of downtown Philadelphia and handles both domestic and international flights. It is one of the busiest airports in the United States, serving millions of passengers each year.