U.S. airlines carried 414.4 million passengers during the first six months of 2017, besting the previous high of 403.1 million set in 2016. According to the U.S. Department of Transportation’s Bureau of Transportation Statistics, there were 360.9 million domestic and 53.5 million international passengers during the first two quarters of the year. The increase was due to growth in international passenger travel outpacing growth in international capacity, offsetting a domestic capacity growth rate…