Seattle-Tacoma International Airport has the fastest complimentary WiFi service of any North American airport, according to Ookla LLC, a software firm that runs the site Speedtest.net. Sea-Tac more than doubled its download speed from last year, reaching 103 Mbps (megabits per second.) Denver, which topped the list over the past two years, came in second at 78.7 Mbps. The slowest speeds were in Toronto and Montreal, with download speeds of 7.1 and 6.4 Mbps, respectively, according to the report. Both Canadian entrants improved on their speed from 2017. The data are from tests conducted on Speedtest.net from January to April 2018 by computers logged onto the airports’ Wi-Fi networks. The world’s busiest airport, Hartsfield-Jackson Atlanta, saw the largest one-year improvement in speed, jumping to 59.6 Mbps from 2.7 Mbps, according to the survey data. The ranking does not include airports that charge for Wi-Fi access.