Lufthansa has been forced to cancel hundreds of flights due to a walkout by a number of its ground staff. Members of the ver.di union, who work for Lufthansa at airports including Frankfurt and Munich, held a strike on Thursday that lasted seven hours. The airline and its union are in talks again today (Friday March 22). Lufthansa has so far cancelled around 700 flights. The dispute is over pay and working hours. Lufthansa plans a pay freeze until 2015 as well as extending the working week by one hour. However, ver.di is requesting a 5.2 per cent wage increase. According to local news reports, Stefan Lauer, a Lufthansa board member who is in charge of its labour relations, is to step down this summer. Last year, Lufthansa lost €33m ($43m) due to staff strikes.