Log in to AILA.org and click on the welcome message at the top-right.
This is your My AILA page. Click on Add Additional Chapters to be directed to the AILA Shop page where you'll select the Chapter(s) you wish to join.
Note that Chapter dues will be prorated based on when in your membership term you join the Chapter. Select the Chapter(s) you wish to join by clicking "Add to Cart." The button will change to "Item in Cart" when it has been added to your cart. Click "Item in Cart" or the Shopping Cart icon at the top-right to enter your payment information and check out.
Contact Membership@AILA.org for more information.