There are warnings of queues at passport control at airports in Europe over upcoming holiday periods, as the rollout of a new biometric border system continues.
Passengers have already reported hours-long waits at some destinations, at busy times, due to the new systems.
A group representing airports said there was a risk of five-to-six-hour queues over the summer.
However, the European Commission said it would be possible to suspend the new system at peak times until September.
Videos posted on social media in the past week describe three-hour queues at Geneva airport's passport control.
