The EES system was due to go into effect on September 6, but Portugal and eight other countries decided to postpone the launch. The cause was software failures and the threat of chaos at the borders.

Flight companies, including Ryanair, had to ask for an extension of the grace period. Airports fear the system's tough implementation will disrupt the tourist flow in high season. Experts note that biometric scanners and passports are working, but automatic verification is delayed.

The Portuguese prime minister has previously confirmed a transition period, but the rules now depend on fixing technical problems throughout the Schengen area.