Over 100,000 passengers are set to see their flights disrupted.
Ryanair's chief executive claims next week's air traffic control strike in France will cost his company almost €23m .
But Mullingar's Michael O'Leary says it will be the customers who will be worse off.
He believes 100,000 passengers could see their flights disrupted.
The industrial action over pay and working conditions is due to take place from Tuesday until Friday morning.
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