In the social network Twitter, the cheap company said that a "small number, about 190 out of a total of 20,000" compensation checks issued in July, without the required signature were sent due to an "administrative error".
The checks were resubmitted last week, according to Ryanair, who apologized to affected customers.
Since April, strikes by air traffic controllers and protests from pilots and cabin crew of the company have affected the operation of the Irish airline.
A spokesperson for the airline has today reaffirmed that Ryanair "fully complies" with the Community Compensation Directive.
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