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K
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Thousand (e.g., 40K = 40,000)
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KCAS
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Knots Calibrated Airspeed
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KEAS
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Knots Equivalent Airspeed
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KIAS
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Knots Indicated Airspeed
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Kick the Tires and Light the Fires
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Formerly, to bypass or severely shorten the required routine of physically inspecting the aircraft prior to flight. Currently meaning, "Let's get this aircraft preflighted and outta here pronto!" (See Rapid City Freestyle).
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Kill
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Directive to commit on target with clearance to fire in visual or beyond visual range; implies hostile and ROE compliance; in training, fighter call to indicate KILL ROE has been fulfilled.
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Killbox
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Also "Kill Container" - a working area similar to CAS Stack (a specified working area while performing a CAS mission).
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Knock-It-Off
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Terminate any intercept/ engagement in progress.
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KT(S)
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Knot(s)
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KTAS
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Knots True Airspeed
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KVA
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Kilovolt Ampere