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GLID is the ICAO generic designator used for sailplanes and gliders when the specific manufacturer or model is unknown or unspecified in flight plans. Unlike powered aircraft that carry distinct type codes for each variant, the soaring community often files under this umbrella code because gliders share similar performance envelopes and present minimal differentiation to air traffic control. The designation covers everything from single-seat club trainers to high-performance racing sailplanes, spanning gross weights from under 500 pounds to over 1,800 pounds and wingspans from 15 to 30 meters. Gliders achieve flight through exploitation of atmospheric lift (thermals, ridge lift, wave lift) and can remain aloft for hours, covering hundreds of miles without engines. Modern composite sailplanes routinely achieve glide ratios exceeding 50:1, meaning they travel fifty feet forward for every foot of altitude lost in still air. Cross-country racing sailplanes have reached altitudes above 49,000 feet in mountain wave and speeds exceeding 190 knots, though typical cruise speeds range from 50 to 90 knots. Because they lack engines, gliders have no Vmo or fuel considerations; their operating limits center on VNE (typically 135-165 knots depending on class) and structural load factors during aerobatic maneuvers or turbulence. The GLID code appears in flight plans filed by gliding clubs, university aviation programs, and private owners operating from dedicated gliderports or towplane-equipped airports. Launches occur via aerotow behind powered tugs, winch, or auto-tow, with pilots then navigating by variometer and GPS to exploit lift sources. SkyMeter has tracked 613 flights across 229 airframes and 36 operators, with RED WING SOARING ASSOC the largest observed operator.