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Section 403 of the 2018 FAA Reauthorization Act requires DOT to issue regulations prohibiting passengers from engaging in voice communications using a mobile device onboard aircraft on scheduled passenger flights within the United States with limited exceptions. The Federal Communications Commission (FCC) has rules restricting airborne use of mobile devices that can operate on certain commercial mobile frequencies. However, the FCC does not prohibit voice calls over Wi-Fi. Also, many U.S. air carriers have the capability of allowing their passengers to make and receive voice calls in-flight over Wi-Fi though the Department is unaware of any U.S. carrier that permits voice calls. This rulemaking would implement the 2018 FAA Act by prohibiting airlines from allowing passengers to engage in voice communications using a mobile device onboard aircraft, regardless of whether the call is made on a commercial mobile frequency, Wi-Fi, or other means.