Purchasing one way tickets....

[rastagirl777]

could be -- since you're a frequent flyer, your TSA info is probably already stored in your FF profile.

No, they don't. I've never been asked to enter my passport number anywhere but on an immigration form. I've never signed up with that Clear Skies (or whatever it was called before it went belly up) - the only information that anyone would have would be the required information for traveling anywhere these days - name, birth date and gender. TSA doesn't have access to my American Airlines frequent flyer account to my knowledge. These days who knows who has access to what though but again, my passport number is not recorded anywhere in my AA frequent flyer or profile accounts.

[Rob]

...TSA doesn't have access to my American Airlines frequent flyer account to my knowledge. These days who knows who has access to what though but again, my passport number is not recorded anywhere in my AA frequent flyer or profile accounts.

They key phrase is "to my knowledge". With all the cross referenced databases that the TSA has access to, I think it is harder to believe for them not to have access to your passport number. And please remember that while your passport number is not shown anywhere in your AA Frequent Flyer profile that you have access to see, they do have additional information in your FF profile that you cannot see...