According to this, the airport card slot on an iBook G3 is just a regular PC Card slot.
I was wondering if anyone here ever tried a third-party PCMCIA Wi-Fi card -or even other PCMCIA cards, like a USB adapter- and if something like this would work, disregarding obvious size differences.
Well, there's this - https://www.geektechnique.org/projectlab/662/diy-airport-for-that-old-ibook.html - where someone used a Lucent card in his iBook, but still only 802.11b and still not able to connect to modern secure networks.
I think you can probably get a genuine Airport card for less these days, with no hacking around 😉
As for other PCMCIA cards, even if you could cut one down enough to fit, there's no way to get at the interface for say, a card with USB ports.