UA: Any on-line-employee can at least:

* check your flight-pattern (at the least the current year and one year before) looking at your mileage-plus-account (if he/she wants so)
* check your profile (status, credit cards, flight preferences)
* on the profile they can make special notes (I know they can, I don't know what they "usually" will put there: why don't they put there the newly requested info on "the Relativ to be informed in case of an emergency"?).