An empty Lufthansa check-in counter in the departure hall is pictured during a strike by Lufthansa pilots Berlin's Tegel Airport February 22, 2010. About 800 flights per day will be cancelled over a four-day period, as pilots at Deutsche Lufthansa went on strike on Monday after last-ditch attempts to reach a compromise failed over the weekend. Picture taken with a wide angle lens. REUTERS/Fabrizio Bensch (GERMANY - Tags: TRANSPORT CIVIL UNREST EMPLOYMENT BUSINESS)