I'm very interested in flyzed, but haven't yet figured out how to get in. I can get into gozed using NW, a three-digit code (is this what you mean by 3-char IATA code?), and a password. I've tried various combos of these to get into flyzed, w. no luck.
I'm keenly interested for the future because my wife and I (parents of a NW pilot) just had our first international ZED trip (JFK-MRS-JFK) and the return leg was hellish: getting out of CDG on AF was a nightmare, they treat non-AF folks badly, or at least on the day we travelled (Mar 21, which turned into Mar22); we got refused on about 10 CDG-NYC flts and finally in desperation turned to the one NW flt out of CDG (to DTW) and lo and behold we graduated from low-lifes back to real people, and got the last 2 business class seats. Thanks NW! But even there it matters who you talk to: the first NW CSR took one look at our CDG-JFK tix and said "go away, we can't fly you to DTW with this!"