'Bring 'em on': Most profitable airline Delta wants United's crown over the Pacific, too

United Airlines and Delta Airlines jets Sam Hodgson | Bloomberg | Getty Images RIO DE JANEIRO — Delta Air Lines is the nation's most profitable carrier, but its hungry rival, United Airlines , is far bigger over the Pacific. Delta's new president, Peter Carter, says that just won't stand. "We want to become stronger, better, faster in the trans-Pacific, and we want to become the leading U.S. …