Services at Birmingham International Airport could be disrupted at Christmas as a union begins balloting members over industrial action.
The Amicus union is balloting some 400 members about striking over a management plan to alter its pensions provision for workers. BBC News Online reports the airport's management plans to close its pension scheme to new members and replace it with one that would give lower returns.
Birmingham Airport said negotiations with the union were continuing.
Airport firefighters and engineers will be balloted separately. Strike action could close the airport during one of its busiest seasons, because under Civil Aviation Authority regulations, an airport cannot operate without the fire service.