Since the 1980s and into the early 1990s, the airfield was heavily congested. Originally the terminal was intended to house between 5 and 8 million passengers per year, but by 1991 the passenger numbers had skyrocketed to twelve million passengers per year, which was up to 50% to more than double the number of passengers that the airport was originally designed to handle. Because the airport's taxiing system had been designed to be used as a smaller medium-size airport, it was unable to handle the large numbers of aircraft that used the airport. To continue operations preliminary annexes to the terminal were built, including a special hall for charter flights. During the night from 16 to 17 May 1992, operations moved to the new location near Freising. The IATA airport code MUC and the ICAO airport code EDDM were transferred to the new Munich Franz Josef Strauss Airport.