The strike at the Frankfurt airport, one of the busiest in Europe, has been extended until Friday. Tarmac workers went on strike last week over pay and hours. The airport says that many flights will be canceled, and that safety is their top priority. The airport also said that the union will have to compromise for an agreement to be reached, and that their demands are unreasonable.
See "More flights grounded as Frankfurt airport strike continues", February 20, 2012