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Also, I am viewing "Visa Signature account number" as meaning something internal, not just the number on the card, so even if AUs did have different credit card numbers that wouldn't help.
Otherwise, for cards where all have the same number. those that like to push the limits: User 1 gets the credit. And then, "oh no, my card is lost or stolen" and get it reissued with a new number. Now AU1 gets the credit. Rinse and repeat. I'm pretty sure this won't work!
I went for it. App'd for the Navy Federal Flagship Rewards card. Looking for that TSA pre-check credit. I got a 24-48 hour notice, so hopefully y'all see an announcement in approvals that I got it. I'll keep you posted. Thanks for the feedback and info and helping me decide on this over the Altitude Connect.