Ryanair today attempted to increase pressure on its rivals by offering to pay passengers €1 to fly with the airline.
The unusual offer applies to all flights on all routes between November 20th and December 20th and ends on midnight on Thursday.
But this does not mean patrons will earn money by flying with the airline as the €1 will be deducted from the standard airport and government charges.
A round trip from Dublin to London or Dublin to Paris will still cost in the region of €30.
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The airline's chief executive, Mr Michael O'Leary, claimed the offer represented the company's costliest ever promotion.