The other, to do with cabin staff on short-haul flights, will already have damaged the airline even if there is a settlement at the last minute before those cabin staff strike on July 9th.
The National Gallery of Scotland was closed by a security staff strike, while only the ground floors of the Scottish National Gallery of Modern Art, the Scottish Portrait Gallery and the Dean Gallery were open.
BBC: NEWS | UK | Scotland | Civil servants take strike action
And Germany's Lufthansa, whose ground crew and cabin staff are on strike over pay, fell 3%.
"It is revealing that only around 25% of the union's staff voted to strike, " he said.
Staff began the strike at 06:00 GMT and about 500 gathered outside the headquarters in West Bromwich.
The airport is owned and operated by Derry City Council and, as a result, the staff are on strike.
On Wednesday it emerged that civil servants were being asked to act as airport border staff during the strike action.
BBC: Public sector strike could see Heathrow 'grind to halt'
Sebelius and Holder partnered in 2009 to increase enforcement by allocating more money and staff and creating strike forces in fraud hot spots around the country.
Unite said it was beginning the legal process to ballot its 450 paramedics and other ambulance staff members for strike action or industrial action short of a strike.
Employing extra people to do the work of staff who are on strike is illegal under employment law.
Thousands of staff, including refuse collectors and social care staff, went on strike the following month, beginning months of industrial action which continued into the autumn.
Neither of the two most popular publications, Les Echos and La Tribune, appeared that day, after staff at both decided to strike.
Medical secretaries and receptionists at three hospitals in West Yorkshire are among staff who have gone on strike in a row over potential job cuts.
The warning from Heathrow, which handles more international passengers than any other airport, came after immigration staff voted to join the strike by public sector workers.
BBC: Public sector strike could see Heathrow 'grind to halt'
Thousands of post office counter staff have voted to go on strike, in a dispute over pay and job security.
Thousands of BBC journalists and technical staff are to be balloted for strike action over increased workloads, stress, and job losses.
Thousands of staff at the Post Office will strike on Easter Saturday in a dispute over shop closures, jobs and levels of pay.
College staff held a half-day strike on Monday in protest at the job cuts, with 150 demonstrating outside the meeting at its Tonbridge campus.
Last week's action by Unison members at hospitals in Wakefield, Dewsbury and Pontefract followed a ballot in October which saw 88% of those administrative and clerical staff balloted voting in favour of strike action.
"The result shows that a significant proportion of our staff do not wish to take strike action and would like to work with us in delivering our plans to bring the business into profit, " said Kevin Gilliland of the Post Office.
Ground staff have called a one-day strike amid an ongoing pay dispute with the airline.
Staff at two Coventry schools are on strike over plans to turn their institutions into academies.
EU's powerful staff unions, which have gone on strike to block even the discussion of reforms.
Council staff in north London have gone on strike for the fourth time in protest at outsourcing plans.
Chris Cahill from Unison, which represents civilian staff, said it was ruling out strike action for the time being.
But a narrowly averted strike over pay by airline staff in the run-up to Christmas delayed, and may block, the switch.
Southampton council workers, including refuse collectors and social care staff, are to stage a fresh strike in a long-running row with the authority.
Unions fighting potential job cuts at three NHS hospitals in West Yorkshire have been invited to talks following a three-day strike by clerical and administration staff.
The college has 1, 100 staff in total, and those taking strike action said they were not only fighting for their own future, but for the future of their students.
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