typo or freudian slip?
From the website:
United Airlines is the Official Airline of the 2007 Folsom Street Fair. If you or your travel agent call United’s toll-free number (1-800-521-4041) to book your reservations, you will receive a 2% discount off the lowest applicable discount fare, including First Class or a 5% discount off full fare unrestricted coach fares, purchased 7 days in advance.