Just for your information. This is the message I got when I applied for AP in early 2006. Texas service center.
Receipt Number: SRC06082XXXXX
Application Type: I131, APPLICATION FOR USCIS TRAVEL DOCUMENT
Current Status: Approval notice sent.
On February 9, 2006, we mailed you a notice that we have approved this I131 APPLICATION FOR USCIS TRAVEL DOCUMENT. Please follow any instructions on the notice. If you move before you receive the notice, call customer service.