; and (2) the prevalence of vectoring flights due to over-crowded departure and arrival paths and alternatives to this practice. (b) Report The Comptroller General shall submit to Congress a report on the results of the study. 167. Airport noise mitigation and safety study (a) Study Not later than 180 days after the date of enactment of this Act, the Administrator of the Federal Aviation Administration shall initiate a study to review and evaluate existing studies and analyses of the relationship between jet aircraft approach and takeoff speeds and corresponding noise impacts on communities surrounding airports. (b) Considerations In conducting the study initiated under subsection (a), the Administrator shall determine— (1) whether a decrease in jet aircraft approach or takeoff speeds results in significant aircraft noise reductions; (2) whether the jet aircraft approach or takeoff speed reduction necessary to achieve significant noise reductions— (A) jeopardizes aviation safety; or (B) decreases the efficiency of the National Airspace System, including lowering airport capacity, increasing travel times, or increasing fuel burn; (3) the advisability of using jet aircraft approach or takeoff speeds as a noise mitigation technique