I made my complaint:
Angry that you broke my ability to configure my airport with Mavericks.
Angry that I had to jump through a lot of hoops to find that out.
1. Airport service and report (instead of that link you could have put It won't work)
2. Several links from there.
3. read through many pages to try to find the software or firm ware that might help.
4. Finally came to the conclusion that there was no combination of 802.11g and Mavericks.
5. Went to community support where one of you customers revealed "It won't work"
6. Googled it and found a page that would make it work.
7. Decided I would just buy a new router.
8. Will go spend money angrily to update the thing.
You can too - Apple - AirPort Express - Feedback
you can also google the issue for a solution