The Federal Aviation Administration began a six month review process for a mandatory curfew at Bob Hope Airport, and is expected to make a decision on the curfew by Nov. 1. A consultant study concluded that the $67 million in benefits from implementing a curfew would outweigh the $48 million in costs to airlines, passengers, cargo carriers and general aviation that would result from restricting airline activity between 10 p.m. and 6:59 a.m., save for some exceptions, including emergencies and medical flight aircraft. Noise generated by aircraft using the airfield has long been controversial, particularly for the authority and the city of Burbank. The airport authority began the study in 2000 to meet requirements set out by the Federal Aviation Authority to show that a curfew is reasonable and nonarbitrary; does not create an undue burden on interstate commerce or the national aviation system; does not conflict with federal law; makes efficient use of navigable airspace; and allowed for adequate opportunity for public comment. In interviews with general aviation companies based at Bob Hope, the study concluded that approximately 24 aircraft would leave the airport if the curfew was approved. The planes would relocate primarily to Van Nuys Airport, with some going to Whiteman Airport in the east Valley, and Camarillo Airport.