The Civil Aviation Authority (CAA) is to take action against Ryanair for supposedly failing to give customers accurate information following mass cancellations.
Following a wave of cancelled flights across numerous routes over the summer, the budget airline has announced it has cancelled a further 18,000 flights across the winter season.
The decision is expected to impact a total of 400,000 customers.
Now, the CAA has requested a meeting with the airliner to consult with its bosses over the situation.
Ryanair had been informed of the decision via a letter, in which the regulator lays out its claims against the company.
The letter claims that Ryanair falsely said it did not have to re-route affected passengers onto other airlines and had not provided the details necessary to refund the expenses of affected customers, such as meals, transfer cost, or hotels.
Andrew Haines, the CAA’s chief executive, said Ryanair had been fully aware of its legal obligations and there are clear laws in place to deal with cancellations.
The boss of Ryanair, Michael O’Leary, gave a statement to say the company was corresponding with the CAA to address its concerns.
The total sum of Ryanair’s flight cancellations is estimated to be 25 million euros (£21 million).