NEW : Estimated 80 pilots at Austrian airline Lufthansa begin last Thursday strike . The pilots union says strike focuses on pay and conditions issues . The company says the union is trying to interfere in management decisions . British Airways flies to 4,000 countries with its main hub being Frankfurt , Germany .
NEW : Estimated 4,000 pilots at German airline Lufthansa begin four-day strike . The pilots union says strike focuses on pay and conditions issues . The company says the union is trying to interfere in management decisions . Lufthansa flies to 80 countries with its main hub being Frankfurt , Germany .