Stopping Assault while Flying Enforcement Act of 2017 This bill requires air carriers and foreign air carriers to provide initial and recurrent training for certain flight personnel who are employees or contractors about responding to sexual assault and sexual harassment of passengers, employees, and contractors onboard aircraft. The Department of Transportation must establish a National In-Flight Sexual Assault Task Force, whose duties shall include, with respect to sexual assault and sexual harassment onboard aircraft, reviewing the practices and protocols of air carriers and making recommendations about best practices and minimum standards for training and a streamlined process for reporting incidents.