If you were stopped from boarding an easyJet or Ryanair flight due to your passport not 'being valid', you could claim significant compensation.
Passport rules have changed since Brexit, as Brits can no longer travel to the EU on a passport that is about to expire - but a report has now uncovered how customers of the two budget airlines were incorrectly informed that they'd at least six months left their passports, not three, for travel to the EU.
The new EU measures actually mean you must now have at least three months left on your passport after the day you plan to leave an EU country and also apply to Andorra, Iceland, Liechtenstein, Monaco, Norway, San Marino, Switzerland and Vatican City.
The money you could be owed would be on top of a full refund for your original flight.
Civil Aviation Authority (CAA) rules state that passengers who have wrongly been refused entry onto a flight are entitled to either a full refund or an alternative flight.
Coby Benson, a solicitor at Bott and Co also told MoneySavingExpert that incorrectly being denied entry would also be trigger for compensation on top.
He said: "Where the passport has been incorrectly read, then the denied boarding provisions absolutely apply."
The amount of compensation you could be owed depends on the length of your original flight and how delayed you were in getting to your destination.
For example, for an original flight of under 1,500km and disruption time of less than 2 hours later at final destination would trigger £110 compensation.