Less than a month before the deadly midair collision involving a private plane and a sightseeing helicopter over New York's Hudson River, a federal watchdog warned about the lax safety oversight of the for-hire flight business. A report issued by the US Department of Transportation's inspector-general criticized the Federal Aviation Administration for providing significantly weaker oversight of the "on-demand" flight industry - companies hired to fly aircraft, both helicopters and planes, that seat fewer than 30 people - than it does of the commercial airline industry. National Transportation Safety Board Chairman Debbie Hersman, in an interview with The Associated Press before Saturday's accident, said the report makes it clear "that there is disparate level of oversight." The accident across from Manhattan's West Side near the Hoboken, New Jersey, waterfront occurred around noon on an otherwise idyllic summer day when a small private plane with three people aboard collided with a for-hire sightseeing helicopter carrying the pilot and five Italian tourists. The impact scattered debris over the water and forced people on shore to flee for cover. Everyone aboard the two aircraft were presumed dead. Criticism of the FAA's oversight of the on-demand flight industry is nothing new. Since 2002, the NTSB has made 16 recommendations related to safety of the on-demand flight industry. The FAA has not implemented any of them. An FAA advisory committee spent two years examining on-demand flight industry safety, issuing 124 recommendations in September 2005. Nearly four years later, none of those recommendations - many of which paralleled the NTSB recommendations - have been implemented. The report noted that FAA is developing a new approach to safety oversight for for-hire operators that would target the most risky operations. However, it said the new system isn't scheduled for full deployment for at least four years. FAA officials have said they agree with recommendations in the inspector general's report and are implementing them. There are over 2,300 on-demand operators in the US, flying more than 9,000 aircraft. In 2007 and 2008, a period in which there were no deaths due to commercial airline accidents, there were 33 fatal on-demand aircraft accidents in which 109 people were killed. Many of the regulations governing the industry haven't been updated since 1978. Since that time technology has changed. The use of jets by for-hire companies is now common, for example. Operators also fly more complex types of flights and more international flights. On-demand flight operations are inspected far less frequently than commercial airliners even though they often operate under riskier conditions. For instance, they typically fly into small airports without control towers or take off and land in remote locations, from Rocky Mountain ski slopes to the red rock canyons of the desert Southwest. The inspector general's report cited as an example an on-demand operator that flies dozens of flight a day taking tourists to glaciers where the planes land and take off on skis. The operator has 17 planes and was inspected eight times by FAA in 2008. By contrast, a commercial airline with 10 planes overseen by the same FAA office received 199 inspections the same year. For-hire industry pilots are required to have a minimum of 500 hours of flight experience and a commercial license, while a commercial airline captain is required to have 1,500 hours of flight experience and needs to obtain the more difficult air transport license. On-demand companies are also not required to employ an FAA-licensed dispatcher, and their aircraft don't have to be equipped with warnings systems that alert pilots when they are in danger of colliding with another aircraft or flying into the ground. Nor do they have to have cockpit voice or data recorders or in-flight radar systems. There are also less stringent maintenance requirements.