Air passengers experienced disruption to flights to and from Spain and Belgium today due to strikes.
Ryanair cancelled most of its flights to and from Spain as well as all internal flights.
Customers were advised to check the Ryanair website for details of which flights are cancelled.
Aer Lingus planned to operate all but 12 of its flights to Spain. Details of the cancellations are available on the Aer Lingus website.
Some Ryanair flights to and from Belgium were reinstated after an air traffic control strike there ended earlier than expected.
Aer Lingus has reinstated all of its Belgian flights.
The general strike in Spain - the first in eight years - primarily affected transport.
Socialist Prime Minister Jose Luis Rodriguez Zapatero, due to unveil his 2011 budget plan in parliament tomorrow, has vowed to maintain deep austerity measures and labour reforms that make it easier for companies to hire and fire workers.
Trade unions said 10 million people, or more than half the workforce, are on strike. Government officials gave no numbers have and played down disruption.
Analysts say the strike is unlikely to make the government reverse its plans to meet European Union deficit reduction targets.
Hundreds of marchers waved flags, blocked streets and forced some shops to shut in the heart of Madrid.
Union leaders said 30 protesters were detained but most were quickly released.
In northern Spain, car factory assembly lines halted. Few buses were running in Madrid and only half of underground trains, although Labour Minister Celestino Corbacho said a minimum guaranteed service agreed with unions was being met.
‘We'll continue to strike if that's what's needed to bring down the labour reform, which threatens to make jobs even more vulnerable,’ said graphic designer Alfredo Perez at one of the pickets.
The two biggest unions, the CCOO and UGT, called the strike over austerity, labour reform and Zapatero's plans to overhaul state pensions and raise the retirement age to 67 from 65.
