Ryanair has been starting more and more in competition with Aer Lingus recently. FR
have also started flying to more "real" airports and not airports that are actually 50 miles from the intended destination. I suspect Aer Lingus will continue to offer competitive fares on the route. Aer Lingus has some good offers, no check-in charges, assigned seats, cheaper baggage fees, no online check-in charge and a better on board product (in my opinion) so I think EI
will be able to handle the competition on the Nice route.
The increase in competition will be good for the passenger, not that Aer Lingus has been ripping them off all these years
I dont think U2
will be worried about Ryanair's Nice route at the moment but they know what FR
are capable of, they can expand operations at airports extremely fast and Easyjet will be aware of this.