A NASA web publication divides jet development into five stages pioneer (straight wing), swept wing, transonic, 1960s and 1970s on, culminating in types such as the F-15, F-16 and AV-8A. Taylor and Guilmartin name four subsonic, transonic, supersonic and Mach 2, and add a fifth "new" generation with multimission capability and culminating in types such as the F-16 and MiG-29. Other schemes comprising five generations up to around the same period have since been described, although the demarcation lines between generations differ. Hallion proposed a classification of jet fighters into six generations up to that time.
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