The “Guardians of the Galaxy” misfits reached a new box office stratosphere over the U.S. Labor Day weekend, soaring past fellow Marvel hero “Captain America” to become the highest-grossing domestic movie of 2014. “Guardians” rung up $16.3 million in U.S. and Canadian ticket sales from Friday through Sunday, topping weekend charts for the third time since its Aug. 1 debut, according to estimates from tracking firm Rentrak. Total domestic sales climbed to $274.6 million, surpassing the $259.8 million earned by April release, “Captain America: The Winter Soldier.”
