Austrian Airlines passes on the booking references (so-called "PNRs" = "Passenger Name Records") of all passengers flying with us from, to or via the USA and/or Canada to the US and Canadian immigration authorities.
Your PNR contains all the information you provided in connection with your flight booking, which is stored in our reservations system. At present, the USA and Canada are the only countries who require us to pass on these data.
There is a basic difference between PNR data and API (= Advanced Passenger Information) data. API data are contained in your passport (last name, first name, date of birth, nationality, passport number, gender); they are recorded during the check-in process (usually through electronic reading of the magnetic strip on your passport) and passed on to the authorities immediately after departure. We are required by law to pass on these data for passengers entering some countries, e.g. the USA, Canada, Japan and India.
All information can be found in detail on the Entry Regulations page.