This leads to flyers facing hidden charges, while the airline does not have their contact details to inform them about flight changes.
Meanwhile, in common with other budget airlines, easyJet saw a surge in passengers in September, carrying 7.6% more in than it did in the previous month.
September’s results followed a record-breaking month in August.
The airline said it was on track to make full-year pre-tax profits of £675 million to £700 million.