Lufthansa canceled more than 1,300 flights Friday, compounding a week of nightmares for travelers using the major European airline. Workers at seven German airports, including Munich, Frankfurt, and Hamburg, took collective action Friday, according to CNN. The full-day strike halted Lufthansa's operations in Frankfurt and Munich Friday, affecting thousands of would-be passengers. "For Friday, 17 February, the German union Ver.di has called for a one-day strike at various airports in Germany," read an update on Lufthansa's website. "Due to the closure of the airports in Frankfurt and Munich on this day, all Lufthansa flights that should have taken off or...