Then why does kismac list a Apple Airport (not extreme) passive mode driver in the software? I've found a lot of contradictory info on this.
That feature only works with prism2 based pcmcia or USB wireless devices. Your airport card uses a hermes chip set (like the Orinoco cards).
If you want to take advantage of all KisMAC features I recommend you get one of these cards:
It is the one I use with my G4 Ti book and it works flawlessly under 10.4.6.