Originally Posted by bhatnasx
Welcome to Flyertalk, Lexis9526!
If I recall correctly, as it's been a while since I used the SA discount, you don't need to actually have a number, do you? If you're traveling between stations with the kiosks to check-in, you shouldn't require it as you won't run into anyone asking to see it. But try the discount codes first as some of them will produce better discounts than SA.
Thanks bhatnasx! When I try to book a ticket online, it asks me for the code when I'm about to pay. Will it be bypassed if i use the machines in NY penn station?