The Dixie Chicks have added 15 dates to their successful "Fly" tour. Through 49 shows the award-winning trio has pulled in more than $25 million. The tour originally was set to end Oct. 29 in New Orleans, but will continue into December. Some concert stops have yet to be confirmed, but the band will be returning for additional shows to Denver, Phoenix, Los Angeles and San Diego. Willie Nelson, whom the women cite as a major influence, will join the bill on some dates. The Chicks also have three high-profile TV appearances coming up. In addition to the CMA Awards on Oct. 4, Dan Rather interviews the feisty band on CBS' 60 Minutes II Oct. 10. NBC will air the trio's first network music special Nov. 20.