Frankfurt Airport, continental Europe's largest, enjoyed an unprecedented number of fliers in 2004, with a 5.7 percent jump in traffic over 2003, its operator said Thursday. The airport closed the year with 51.1 million passengers, setting a new annual passenger record, said Fraport AG, its operating company. Most of the growth was seen in intercontinental flights, particularly connections to North America, the Middle East, and southern Asia. It also achieved double-digit growth in freight tonnage, which was up 13.1 percent over 2003.