“These constraints are causing unnecessary delays of up to 2.5 hours for passengers – many of whom are travelling with young children,” said a statement from the company.

“In the last two weeks alone (from 26 May to 9 June), more than 270 passengers travelling from Faro, Lisbon or Porto airports have missed their flights due to excessive delays at border control caused by staff shortages. This situation is completely unacceptable and the new Government must take urgent action to ensure that border control at Portuguese airports is adequately resourced, especially during the morning peak, in order to avoid unnecessary delays and more passengers unfairly missing their flights”.

Ryanair’s Chief Operating Officer, Neal McMahon, said: “It is unacceptable that passengers – many of whom are travelling with young children – are experiencing delays of up to 2.5 hours at border control at Faro, Lisbon and Porto airports due to staff shortages. In the last two weeks alone, more than 270 passengers have missed their flights simply because the airport operator, ANA, failed to ensure there were enough staff to manage border control at these airports – some of the main ones in Portugal. This situation is unsustainable and will only get worse with increased traffic as we head into the peak summer season.

“Ryanair calls on the new Government to urgently intervene and address the staff shortages at border control at Faro, Lisbon and Porto airports to ensure that Portuguese families do not have to endure 2.5-hour queues just to start their well-earned holidays.”