Despite facing radio and record boycotts after singer Natalie Maines's now-notorious anti-Bush remarks, the Dixie Chicks are still whistling "Dixie" when it comes to their concert ticket sales, Billboard reports.

"To be brutally honest, there has been no effect, other than the odd phone call to a building inquiring about a refund. There's a lot more noise than action," Rob Light, the trio's agent, tells the music publication.

"Actually, the buildings are getting more asking, if there are refunds, can they buy the tickets," adds Light, explaining that there is a no-refunds policy.

Light claims that out of 59 shows, only six have seats left -- although those are already about 90 percent sold out and are expected to be filled to capacity. On March 1, the day tickets went on sale, some 867,000 were sold, says Billboard. That translates into $49 million.

Then again, Maines, 29, had yet to make her political remark. It was March 10, on the eve of war in Iraq, when she announced during a London concert that she was "ashamed" that President Bush was a fellow Texan.

As a result, domestic sales of the Chicks' CD "Home" have slipped.

The Chicks' U.S. leg begins May 1 at the Bi-Lo Center in Greenville, S.C., and wraps up Aug. 4 at the Gaylord Entertainment Center in Nashville.

In other Chicks news, the group has announced it will speak to ABC's Diane Sawyer on this week's "Primetime Thursday," their first sit-down interview discussing the controversy.