; 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; and (4) if the Administrator determines that using jet aircraft approach or takeoff speeds as a noise mitigation technique is advisable, whether any of the metropolitan areas specifically identified in section 189(b)(2) would benefit from such a noise mitigation technique without a significant impact to aviation safety or the efficiency of the National Airspace System. (c) Report Not later than 2 years after the date of enactment of this Act, the Administrator shall submit to the appropriate committees of Congress a report on the results of the study initiated under subsection (a). 180. Regional ombudsmen (a) In general Not later than 1 year after the date of enactment of this Act, with respect to each region of the Federal Aviation Administration, the Regional Administrator for that region shall designate an individual to be the Regional Ombudsman for the region. (b) Requirements Each Regional Ombudsman shall— (1) serve as a regional liaison with the public, including community groups, on issues regarding aircraft noise, pollution, and safety; (2) make recommendations to the Administrator for the region to address concerns raised by the public and improve the consideration of public comments in decision-making processes