Ackermand et al.(2006): Lazulite-bearing metaquartzite of the Itremo Group (Central Madagascar); Scientific significance and economic importance in Proceedings of the Malagasy-German Research Cooperation in Life and Earth sciences, 5-18
The fastest fighter aircraft is the MiG 25, with speeds topping at Mach 3.2 (2,450 mph/4,000 km/h). Pilots were not allowed to go beyond Mach 2.8. Above Mach 2.8, the engines would overheat and burn up.
How fast do planes go? According to , the record fastest speed for an airplane is 2,193 mph (according to the Guinness Book of World Records, 1989. New York: Bantam, 1989: 204.) or 4,520 mph (according to the World Book Encyclopedia, New York: World Book, 1996: 208.). These are of course not normal passenger planes. Every type of plane flies at a different speed. A commercial Boeing 747 has a cruising speed of about 550-600 mph.