Top European and U.S. officials failed to reach agreement on Monday on replacing a deal to share air passenger data which is due to expire on September 30, European and U.S. officials said.
Under post-9/11 anti-terrorism arrangements, European airlines supply U.S. authorities with information on passengers entering the United States including their name, address, payment details and telephone numbers.
An EU court struck down the existing deal on a legal technicality in May but gave the European Union and the United States until September 30 to replace it.
"There still are legal and technical aspects to work on," said an EU official.
Another official explained that a few issues had been solved on Monday and that new talks were scheduled for the second half of the week.