Boeing 737-600

Twin Jet· 6 globally registered

The Boeing 737-600 is the smallest and least-produced member of the Next Generation 737 family, introduced in 1998 as a modernized replacement for the classic 737-500. With seating for 110-132 passengers, the -600 combined the advanced CFM56-7B engines, digital flight deck, and improved wing design of the NG series with a compact fuselage suited to thin routes and challenging airports. Despite its technical refinement, the type found limited commercial success: only 69 were built before production ended in 2006, as airlines favored the larger and more economical 737-700 or opted for competing regional jets. The 737-600 became best known for an unusual niche: classified government shuttle operations. The U.S. Air Force operates a fleet of unmarked 737-600s under the JANET callsign (Just Another Non-Existent Terminal), flying daily rotations from Las Vegas McCarran to Area 51, Tonopah Test Range, and other restricted facilities in the Nevada Test and Training Range. These aircraft, painted in distinctive white-and-red livery with no external markings beyond tail numbers, transport military and contractor personnel to some of America's most secretive installations. The type's modest size, excellent hot-and-high performance, and reliability make it ideal for the short, high-frequency shuttle missions that define the JANET operation. Performance-wise, the 737-600 shares the NG family's 41,000-foot ceiling and Mach 0.82 cruise capability, with a range of approximately 3,200 nautical miles at typical loads. The type's approach speed of around 132 knots and maximum operating speed of 340 knots IAS place it squarely in the narrow-body jet mainstream, while its relatively light maximum takeoff weight of 144,500 pounds gives it an edge at high-elevation or short-runway airports where larger 737s might struggle. SkyMeter has tracked 254 flights across 14 airframes and 2 operators, with DEPARTMENT OF THE AIR FORCE (USAF) the largest observed operator.