AOL Time Warner's America Online says it has partnered with ticket agency Ticketmaster and circus producer Ringling Bros. and Barnum & Bailey to give away a million tickets to online fans. The online portal is offering people a chance to pick up a free ticket when they buy tickets to the circus, affectionately known as "The Greatest Show on Earth," from Dec. 3 through Dec. 5. But freebie-seekers must preregister on AOL's Box Office, an event site launched earlier this year, to get a promotion password. Through its Web site, Ticketmaster is offering Web surfers a similar deal from Dec. 6 through Dec. 13. Terms of the deal were not disclosed.