EES, which requires biometric registration on arrival at EU airports, has also caused delays at some locations when clients are returning home, Heapy said. “It is wise to turn up a little earlier than normal," he added. "Yes, some have been subject to longer queues."

However, he stressed no passengers had been left behind, as had occurred with budget carriers. “Have any [Jet2] passengers missed flights or have any flights left without passengers? No.”

Heapy, who was speaking to media after Jet2 published its full-year results on Wednesday (8 July), said the operator received weekly reports from teams at airports to help identify potential bottlenecks ahead of time. Greece has changed its policy “because of our lobbying,” he claimed.

"The Greek government very wisely decided to delay," said Heapy. "The information from some of the small airports on the islands was that there would be the potential for some rather long queues. They realised it would not be good for their product. Most of the Greek destinations have operated very well."

Jet2’s campaign is ongoing. “We are lobbying overseas governments to try to get them to alleviate," Heapy continued. "All airports have the option to suspend (EES) for five months, which some of them have." He added these airports must “continue to work on the technology to make sure they are not just pushing the problem back”.

Heapy said Jet2’s Red Teams were another reason to book with the operator as they combed queues at airports to help passengers progress through the system.