Aer Lingus has cancelled a number of flights to and from London's Heathrow airport.
BBC: Belfast City Airport runway temporarily closed due to snow
Aer Lingus welcomed the decision and said "Ryanair's offer should never have been made".
The airline also gave an update on its bid for rival airline Aer Lingus.
Last December, Ryanair launched a second--though eventually unsuccessful-- takeover bid for compatriot airline Aer Lingus.
Ryanair, which already owns 30% of Aer Lingus, is making its third attempt to buy its rival.
The only other airline known to have put in a bid for the slots was Aer Lingus.
But Aer Lingus' board rejected the offer in a statement Monday and urged shareholders to take no action.
Loss-making Aer Lingus rejected the bid two years ago and has not yet commented on the new offer.
Ryanair claims the deal will actually create 1, 000 jobs, as it would expand the Aer Lingus short-haul fleet.
The European Commission has blocked a third attempt by Ryanair to take over rival Irish airline Aer Lingus.
Ryanair initially tried to buy Aer Lingus two years ago and already owns 30 percent of the company's shares.
The Irish government currently owns just over 24 percent of Aer Lingus shares.
Cast your mind back to 2001, Ireland, when Walsh faced a similar challenge: taking the reigns at state-owned Aer Lingus.
Many of those, including Italy's Alitalia, Greece's Olympic and Aer Lingus have wilted under the pressure of Europe's widely successful no-frills airlines.
The travel chaos rippled across Europe as many airlines, including Air France, Alitalia, Lufthansa, Iberia and Aer Lingus canceled flights to Heathrow.
We look forward to completing our offer for Aer Lingus subject to receiving approval from the EU competition authorities in early March.
Etihad has stakes in Air Seychelles, Air Berlin, Virgin Australia and Aer Lingus, with these partner airlines contributing 19% of passenger revenues.
Ryanair has said that the European Commission has informed the airline that it intends to block its proposed offer for rival Aer Lingus.
That refers to Air Lingus's lack of any link into long-haul services, unlike the global alliances to which most other large airlines belong.
Educated at a Christian Brothers' school, he went on to work for Aer Lingus - a job that enabled him to travel widely.
The sale of the government's stake in Aer Lingus and part of the forestry company Coillte will be considered when the time is right.
Other assets up for sale include a stake in Aer Lingus as well as parts of the Irish forestry service, but not its land.
However, despite Dublin holding a 25% stake in Aer Lingus, it is the European Union that will decide whether the takeover can go ahead.
Ryanair is making its third attempt to buy Aer Lingus but was given a list of objections by the European Commission in October last year.
Aer Lingus has confirmed it is bidding for six of the Heathrow slots, so that it can start operating between the London airport and Edinburgh.
Air France, Aer Lingus, Lufthansa and TAP Portugal flights were affected.
The spokesman said Aer Lingus is now the third biggest operator at Heathrow and argued it has the advantage over Virgin Atlantic of having short-haul experience.
It has partnerships with Air Berlin, Air Seychelles and Virgin Australia, but also signed codeshare deals this quarter with Aer Lingus and China Eastern Airlines.
It is the third time the airline has attempted to take full control of Aer Lingus, having seen its first bid turned down by the Commission in 2007.
Airlines such as Swissair, Sabena and Aer Lingus, were already facing severe difficulties not least because of the growing competition from cut-price airlines such as Ireland's Ryanair and Britain's EasyJet.
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