If you use S674ML, FLYAA, or any other discount code on the web when you put the reservation on hold, it will show up as TCAB (ticket designator for a discount) in Sabre to the TA who pulls up the reservation. If you don't explain why TCAB is there, the agent probably will delete it from the record and you will not receive the discount.
The TA will NOT be able to see the web code that you entered, so you will need to explain that the TCAB came from a code that you entered on the web.
(edited for clarity)
[This message has been edited by ESpen36 (edited 10-24-2002).]