Lusaka, Zambia is now FLKK.
Let me re-phrase this. FLLC is Lusaka city airport which is now used by the Zambian Air force.
FLKK is the Kenneth Kaunda International airport (LUN).
Neither of these come up if you do a search by the ICAO code here in flightaware. In fact LUN comes up under FLSS which must be the old code.