Rascal Flatts have crossed the 4 million mark for ticket sales during the last four years. The tally includes stadium shows in Chicago and Columbus this summer. The tour will continue through October. In related news, the band's latest album, Unstoppable, has also been certified platinum for shipments of 1 million copies. Its singles include "Here Comes Goodbye" and "Summer Nights." The certification elevates their career album sales to 20 million units in this decade. The band has also sold 10.5 million digital downloads.