Swedish pilots flying for SAS AB, the owner of Scandinavian Airlines, extended a walkout in a pay dispute to a fourth day, joining cockpit crews at Air France-KLM Group in hitting travel the opening weekend of the Euro 2016 soccer tournament. SAS canceled 230 domestic Swedish and European flights Monday, bringing the total to 649 since Friday, as 400 members of the SPF union continue walkouts in a two-month-old conflict about salary and working hours, the carrier said in a statement. Flights operated by Danish and Norwegian pilots, partner airlines and long-haul services will operate, the airline said.  Pilots flying for EasyJet Plc also plan to walk out Tuesday at Amsterdam’s Schiphol airport from 6 a.m. to 2 p.m., the Dutch VNV union said, after negotiations failed to reach an agreement for pilots operating from the hub. Strikes by Air France pilots, energy workers and garbage collectors dogged the opening weekend of the European soccer championship in France. A quarter of Air France’s pilots started a four-day strike Saturday, forcing cancellation of 20 percent of flights over the weekend. Airlines are facing a wave of strikes as they try to cut staff costs to better compete with fast-growing European budget carriers as well as Middle Eastern rivals that siphon traffic to their desert hubs. SAS fell 6 percent to 18.80 kronor at 9:38 a.m. in Stockholm after sliding more than 10 percent on Friday, when the company said low ticket prices and maintenance costs would keep it from boosting profitability as much as originally planned.