By Stephen Mulvey

EU reporter, BBC News



The US has data on all passengers 15 minutes after take-off

The need to renegotiate the deal came as a result of a European Court of Justice ruling in May, and there have been repeated warnings since then that chaos would ensue if the talks failed.

Airlines have been threatened with fines of $6,000 per passenger or withdrawal of landing rights if they fly to the US without supplying the data, which American officials use to try to identify potential terrorists.

But the airlines could face prosecution under national data protection laws in EU member states if they do hand over the information.

Passengers on any flights that failed to supply the data to the US authorities would also risk being held up for hours at US immigration.

SOME THINGS US CUSTOMS KNOWS Your history of missing flights Your frequent flyer miles Your seat location aboard Your e-mail address

However, this agreement was annulled by the European Court of Justice, which ruled that European officials had not given it an appropriate legal basis. The judges gave them until midnight on 30 September to correct the mistake.

The negotiations between the EU and the US on renewing the agreement were expected to centre on legal technicalities rather than issues of substance - however, they appear to have strayed in to controversial territory and become bogged down.

One EU official told BBC News that generally speaking the EU wanted to give away less data, while the US wanted more.

US demands for information are going to go up not down

Hugo Brady

Centre for European Reform

In future, the EU also wants to go over to a system where airlines "push" the data across to the US, rather than allowing the CBP to continue "pulling" it.

Additionally, European privacy authorities want the US to give legally binding guarantees regarding the protection of the data concerned, instead of the existing non-binding undertakings.

On the other hand, US Secretary of Homeland Security Michael Chertoff has said the CBP needs to be able to share the data more freely with other government departments, such as the FBI.

Now that the talks with the EU have run into difficulty, the US has the option of doing bilateral deals with each of the EU's 25 member states, but it is likely to regard this as a last resort.

Passenger profile

The Passenger Name Record (PNR) data that has been transferred up to now, falls into 34 overlapping fields, some of which contain very little information, for example the passenger's name, while others contain a lot, including the passenger's name (again), date of birth, sex, citizenship and so on.

Some of this information is collected when the ticket is booked, some of it at check-in, and some is information about the passenger's travelling history, which can be gleaned from the reservation database. Not all the fields will necessarily be filled in.

The data can be broken down into the following categories

Information about the passenger : name; address; date of birth; passport number; citizenship; sex; country of residence; US visa number (plus date and place issued); address while in the US; telephone numbers; e-mail address; frequent flyer miles flown; address on frequent flyer account; the passenger's history of not showing up for flights

: name; address; date of birth; passport number; citizenship; sex; country of residence; US visa number (plus date and place issued); address while in the US; telephone numbers; e-mail address; frequent flyer miles flown; address on frequent flyer account; the passenger's history of not showing up for flights Information about the booking of the ticket : date of reservation; date of intended travel; date ticket was issued; travel agency; travel agent; billing address; how the ticket was paid for (including credit card number); the ticket number; which organisation issued the ticket; whether the passenger bought the ticket at the airport just before the flight; whether the passenger has a definite booking or is on a waiting list; pricing information; a locator number on the computer reservation system; history of changes to the booking

: date of reservation; date of intended travel; date ticket was issued; travel agency; travel agent; billing address; how the ticket was paid for (including credit card number); the ticket number; which organisation issued the ticket; whether the passenger bought the ticket at the airport just before the flight; whether the passenger has a definite booking or is on a waiting list; pricing information; a locator number on the computer reservation system; history of changes to the booking Information about the flight itself : seat number; seat information (eg aisle or window); bag tag numbers; one-way or return flight; special requests, such as requests for special meals, for a wheelchair, or help for an unaccompanied minor

: seat number; seat information (eg aisle or window); bag tag numbers; one-way or return flight; special requests, such as requests for special meals, for a wheelchair, or help for an unaccompanied minor Information about the passenger's itinerary : other flights ticketed separately, or data on accommodation, car rental, rail reservations or tours.

: other flights ticketed separately, or data on accommodation, car rental, rail reservations or tours. Information about other people: the group the passenger is travelling with; the person who booked the ticket

The CBP system has been built in such a way that some "sensitive" information is filtered out.

Protected data

According to the undertakings on data protection provided by the US, this includes "personal data revealing racial or ethnic origin, political opinions, religious or philosophical beliefs, trade union membership, and data concerning the health or sex life of the individual".

This means that Halal or Kosher meal preferences will not show up, while requests for a vegetarian meal will.

The PNR data is not used simply to check names against blacklists of known suspected terrorists, but to find new suspects with suspicious patterns of behaviour

"You can be sure that the US will construe whatever they can from the information provided. You can construe a lot from someone's name," says Hugo Brady of the Centre for European Reform.

The PNR data is not used simply to check names against blacklists of known suspected terrorists, but to hunt for people with suspicious patterns of behaviour.

"They have compiled a number of scenarios which they believe amount to suspicious activity and the data is screened for a match. Did the passenger pay cash, did he have baggage? And so on," says Hugo Brady.

He adds: "US demands for information are going to go up not down and we are going to have to find a way of aligning security and privacy to a mutually satisfactory end."