As aviation technology matured into the Jet Age in the 1960s, comfort and sound levels gradually became more office-like and hence more conducive to distractions. Multi-person flight and cabin crews, autopilots, in-flight meals, newspaper service and other comforts further increased the availability and convenience of non-flight related activities for flight crews during flight time.[4] The introduction of the Cockpit Voice Recorder as an objective onboard observer played an important role in the assessment of the problem during accident investigation by the NTSB, and eventual implementation of the rules by the FAA.[2]