Portugal and Italy plan to continue carrying out non-EU border checks for UK holidaymakers at airports, despite hopes they would suspend the practice.
Greece has already dispensed with the new Entry-Exit System (EES) rules, which requires all non-EU travellers to submit facial scans and fingerprints at kiosks in most border crossings.
Sources say these measures have pushed some airports to "breaking point" with long queues of holidaymakers waiting to gain entry, The Daily Mail reports.
Despite fears of further disruption this summer, the European Commission confirmed that Portuguese and Italian airports will be continuing with the system.
Other European nations - including France, Spain and Croatia - are reportedly considering ditching EES, which could see the new rule system "collapse like a house of cards".
Seamus McCauley, of travel company Holiday Extras, says nations reliant on tourism may have little choice but to defy the EU Parliament and ditch the biometric checks.
He said: "Countries are not going to sit back and let Greece take their trade because they won't face EES delays at airports. To do so would be politically toxic as jobs are on the line.
"The rollout has been an utter fiasco. British tourists are worth £3billion a year to the Greek economy and it has rightly decided it will not jeopardise that because EES is not working properly."
The EES model has also prompted fierce criticism from the aviation industry, with the likes of Ryanair calling on the EU to suspend the "half-baked system".
Its chief operations officer Neil McMahon said: 'Governments are attempting to roll out a half-baked IT system in the middle of the busiest travel season.
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'Passengers are paying the price, being forced to endure hours-long passport control queues and in some cases missing flights. The solution is simple – governments should suspend EES until September."
The EES system was introduced in October 2025 but has faced repeated delays, despite being scheduled to be fully operational by April 2026.
Spanish police said Alicante Airport, one of the busiest in Europe, was "pushed to breaking point" by congestion as a result of the new rules.
Elsewhere in Spain, a British mother and daughter reportedly missed their flight after waiting in queues for their biometric checks.