According to the BTS According to the BTS Bureau of Transportation Statistics According to the BTS roughly half of the flights delayed due Department of Transportation roughly half of the flights delayed due According to the BTS roughly half of the flights delayed due Department of Transportation According to the BTS roughly half of the flights delayed due rita.dot.gov According to the BTS Bureau of Transportation Statistics roughly half of the flights delayed due Department of Transportation (DOT) has a website US DOT data roughly half of the flights delayed due