What does JK stand for?

Central Caribbean Air Ltd. (SAUO)

Flip-Flop Circuit - Computer science

Jack (MSA)

Jammu & Kashmir - Indian Railway (TIR)

J and K input (SAUS)

Jishu Kanri - Voluntary Management - Japanese method for increasing productivity of industrial workers by involving them in planning

Jumper's Knee (MELL)

Junk - Ship's rigging (ROG)

Just Kidding - Online dialog

Sun World - ICAO designator (AD)

Trabajos Aereos y Enlaces SA - Spain - ICAO designator (ICDA)