Italy's competition watchdog on Monday initiated non-compliance proceedings against Ryanair that could see the airline fined up to five million euros ($6 million)over its recent waves of cancellations.

The procedure was launched after Ryanair ignored an order to update its website and standard emails to ensure Italian customers were made fully aware of their rights to re-booking, re-routing and compensation in the case of flights being cancelled, the Antitrust regulator said in a statement.

The company challenged the order, which required the changes to be made within ten days, but its appeal was rejected by a tribunal last month.

Ryanair has cancelled more than 20,000 flights scheduled between October and March as a result of staff shortages triggered by pilots and cabin crew leaving the company or being required to take holidays before the year end.

More than 700,000 people have seen their travel plans ruined and the airline has been slammed by consumer groups and regulators for its handling of the crisis, particularly in relation to the rights of customers whose flights are cancelled.

Britain's Civil Aviation Authority reprimanded Ryanair's CEO Michael O'Leary in September for wrongly claiming that the airline was not obliged to re-route cancelled passengers on other airlines.

The company, Europe's biggest airline by passenger numbers, said Monday that it carried 9.3 million travellers last month, up six percent on November 2016.

That was its slowest rate of growth in three years but the company is sticking by its pre-crisis profit forecast despite the cancellations.

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