< PrevNext > 100. AT&T Dallas Share 2018 U.S.-Booked Air Volume: $46 millionTelecommunications giant AT&T returns to the CT 100 after a several-year absence, based on a BTN estimate of its 2018 U.S.-booked air spend. It did so not yet accounting for the $85 billion June 2018 acquisition of Time Warner. That transaction closed nearly two years after the deal was announced and after a lengthy legal fight with the U.S. Department of Justice. Time Warner subsequently was renamed warnermedia and now is a wholly owned subsidiary of AT&T. Excluding warnermedia, AT&T accounted for 92,500 metric tons of carbon dioxide equivalent emissions due to business travel in 2018, down a bit more than 1 percent from the year before. The figure encompasses AT&T's air travel and rental car use except the use of on-demand ground transportation options. AT&T itself is a supplier of remote collaboration and teleconference equipment and collaborates with Cisco's Webex conferencing business. AT&T recorded $170.8 billion in total operating revenue in 2018, including warnermedia revenue after the acquisition, up from $160.5 billion the year before. Operating income decreased in 2018 to $19.4 billion from $29.5 billion in 2017. The company had more than 268,000 employees at the end of 2018, up from 254,000 one year prior.