German airline Lufthansa has cancelled dozens of flights to and from the UK and Ireland, including to and from Newcastle, due to strike action.
Around 100 flights have been cancelled at airports in London, Manchester, Birmingham, Newcastle, Glasgow, Aberdeen, Edinburgh and Dublin.
The German airports affected by the strike are Frankfurt, Munich, Dusseldorf and Hamburg.
The one-day strike, which is due to a pay dispute, will result in only about 20 of more than 1,650 scheduled short-haul flights operating.
The airline said many long-haul services will also be hit , with only six of 50 planned flights operating at its main Frankfurt hub, and only three of 17 in Munich.
Passengers affected by the cancellations can re-book for free, Lufthansa said.
Workers who clean the Tyne and Wear Metro are to start their week-long strike today.
Members of the RMT union working on the Metro announced their plans to take industrial action on Wednesday and will walk out for seven days from this evening in a dispute which has already led to stoppages.
Meanwhile, RMT members employed by Arriva Trains Wales' cleaning contractors have received ballot papers for industrial action over a claim for a pay increase and improved terms and conditions.
Workers who clean the Metro are to start a week-long strike, while cleaners at another rail firm are to be balloted for industrial action in separate rows over pay.
Members of the RMT union working on the Metro will walk out for seven days from Friday in a dispute which has already led to stoppages.
Meanwhile, RMT members employed by Arriva Trains Wales' cleaning contractors will receive ballot papers for industrial action over a claim for a pay increase and improved terms and conditions.
RMT general secretary Bob Crow said the union was stepping up its campaign for improved pay and conditions for cleaners on the railways.
Community health workers in Northumberland have gone on strike over a dispute with the Northumbria Healthcare NHS Trust.
Community nurses, midwives and occupational therapists are walking out for half a day to demonstrate outside a trust meeting at Hexham Hospital. The action comes after disagreements on terms regarding mileage allowances and lease cars.
Health officials say that emergency medical services are still available to patients across the region despite industrial action by doctors.
Numerous Health trusts have reported that between a quarter and two thirds of routine appointments have been cancelled at GP's practices.
Hospital consultants are also taking action against proposed changes to their pensions.
Dr George Rae, a representative of the British Medical Association, says the government has betrayed practitioners with the new pension plans.
Unions have agreed not to strike on June 21.
Industrial action made it difficult for Coldplay fans to travel to the Stadium of Light last week.
Bruce Springsteen fans will not have the same problem next Thursday when he plays the stadium.
Cleaners on the Tyne and Wear Metro are striking for a second day. The walkout, by RMT union members, is over pay and conditions. Cleaners are also protesting about the way a colleague was disciplined. The strike has not affected services.
Tyne & Wear Metro say the service will be unaffected by striking cleaners.