Coming in second, in a four-way tie for second place, were Lufthansa, British Airways, Virgin Atlantic and EasyJet.
Ryanair, EasyJet and Air France run services to Biarritz from UK airports.
Some, like Ireland's Ryanair and Britain's EasyJet, have even managed to grow their business.
The final leg of the journey was on a low-cost airline called EasyJet.
Low-frills airline Easyjet has announced that its chairman, Sir Mike Rake, will stand down this summer.
Budget airline easyJet has cancelled eight flights at its operations at Manchester and Luton airports.
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Southwest in the US, RyanAir, Easyjet and a whole host of others over here in Europe.
"The safety and security of its passengers and crew is Easyjet's highest priority, " a statement said.
Easyjet said security was its "highest priority" and comments were reported to police "where necessary".
Easyjet flights between Belfast International Airport and snowbound Luton have been cancelled until midday.
Easyjet has been in dispute with its founder, Sir Stelios Haji-Ioannou, over the airline's expansions plans.
EasyJet said Michael Rake is stepping down as chairman of the low-cost airline later this year.
M1, and more recently its burgeoning airport, famous as the home of the low-fare EasyJet airline.
Local resident and councillor, Will Scobie, said Easyjet had picked the wrong target for its campaign.
Similar cut-price operators are now emerging in Europe, such as Britain's EasyJet and Ireland's Ryanair.
RyanAir and easyJet, two of Europe's leading budget airlines, learned many of their tricks from Southwest.
Flying, especially on the short breaks pioneered by low-cost carriers such as easyJet, is hugely popular.
Some low-cost carriers, such as easyJet, which had at first refused to use GDSs have relented.
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Launched in 1995 with two planes and two routes, EasyJet now serves 18 cities with 18 aircraft.
This attracted responses from the chief executives of BAA and easyJet, Colin Matthews and Andy Harrison.
The downbeat sentiment saw its rival Easyjet see shares fall 8% while British Airways stock slipped by 5%.
EasyJet is one of a set of low-cost carriers in Europe, including RyanAir and a few others.
EasyJet would like, for instance, to fly from Paris's Orly airport, where some slots may become available soon.
Stelios Haji-Ioannou, the man who got Easyjet off the ground, is the son of a Greek shipping magnate.
Sir Stelios, who founded Easyjet in 1995, quit the airline's board in 2010 because of disagreements over strategy.
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As of 31 December 2012, Easyjet had 213 planes in its fleet, comprising 56 A320s and 157 A319s.
He also said Easyjet might, for the first time, operate flights on Christmas Day to help catch up.
On Thursday Easyjet reported a 9% rise in revenues for the last quarter.
EasyJet, a British low-cost airline, is also building up its fleet and routes.
It does not operate out of Stansted, which is used mainly by low-cost carriers such as easyJet and Ryanair.
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