The Logan Airspace Map* defines the critical airspace around Boston Logan International Airport to protect the flight corridors in and out of the airport. It was created by Massport with input from airlines, pilots, city officials, and the Federal Aviation Administration (FAA) to help guide developers and regulatory authorities on building heights. The map aids developers in their planning and assists the FAA in its review of individual projects to determine if they present a potential hazard to air navigation.
For example, one area of protection is the path that an aircraft must clear if there is a loss of power to one engine. A tall structure in this "one engine inoperative" corridor will interfere with the aircraft, resulting in airlines requesting different runways for departures, or the weight of a plane being adjusted to maintain an appropriate rate of climb.
Boston Logan International Airport led the effort to develop composite maps which is now an industry best practice. The composite map of Logan Airport was one of the reasons cited by the Air Line Pilots Association (ALPA) in August 2008 when it named Logan its Airport of the Year for 2008. ALPA's nomination of Logan noted that the airport "is developing a precedent-setting composite map of critical FAA obstruction surfaces to minimize/prevent further intrusions of tall structures into BOS airspace. Massport has been an industry leader in focusing FAA and industry attention on this critical issue."
*The Logan Airspace Map is intended for informational and conceptual planning purposes only. It does not represent actual survey data nor should it be used in the development of a FAA Form 7460. It does not replace the FAA’s 7460 review process. Consistency with the surfaces shown on this map does not ensure that the proposal will be acceptable to the FAA and air carriers. Massport reserves the right to re-assess, review and seek modifications to projects that may be consistent with the Logan Airspace Map but that through the FAA 7460 process are found to have unexpected impacts to Boston Logan International Airport’s safety or efficiency.