Gulfstream Aerospace Gulfstream Ii-B

Twin Jet

The Gulfstream II-B operated by NASA represents a highly specialized research variant of Gulfstream's venerable business jet platform, transformed into a flying laboratory for atmospheric science and Earth observation missions. Originally developed in the late 1960s as a long-range corporate transport, the GII became a favorite platform for government research agencies due to its combination of high-altitude capability, range, and cabin volume for scientific instrumentation. NASA's conversion added specialized sensor packages, atmospheric sampling equipment, and data acquisition systems while retaining the aircraft's core performance envelope—a service ceiling above 43,000 feet and transcontinental range that enables missions from the Arctic to the tropics. The baseline Gulfstream II pioneered the modern business jet category with its twin Rolls-Royce Spey turbofans, swept wing, and stand-up cabin, setting standards that influenced corporate aviation for decades. NASA's research variant maintains the type's excellent high-altitude performance characteristics, critical for studying atmospheric chemistry, validating satellite sensors, and conducting airborne remote sensing campaigns. The aircraft's ability to loiter at altitudes where few other research platforms operate makes it invaluable for stratospheric science missions. While the GII entered service in 1967 and production ended in 1979, NASA's continued operation of this airframe demonstrates the type's enduring utility for specialized missions requiring altitude performance and payload flexibility that newer business jets often cannot match. The aircraft serves as a complement to NASA's larger research fleet, filling a niche between lower-altitude King Airs and higher-performance ER-2 stratospheric platforms. SkyMeter has tracked flights across airframes and operators, with the sole observed operator.