AT&T announced yesterday that it’s working on a way to bring in-flight Internet access to planes using technology based on the 4G LTE network it uses for smartphones and tablets. Gogo’s stock tanked on the news. It was down as much as 24% after hours. Gogo is one of the most popular providers of in-flight WiFi. AT&T says it will start offering in-flight Internet in late 2015. It’s partnering with Honeywell to install the necessary equipment on planes.