The Associated Press Sunday, March 17, 2002; 11:54 AM BERLIN –– Germany's Lufthansa AG said Sunday it will return to service next month 10 of the 43 planes it idled after the Sept. 11 attacks on the United States and open three new routes this summer. The airline took the aircraft out of service in September and October. It said Sunday it would increase the number of flights to the United States this summer, adding extra flights from its main Frankfurt hub to cities including Boston, Chicago, Los Angeles and Washington. Lufthansa said that its capacity this summer would remain some 10 percent lower than it was in the same period in 2001, although it will offer 7 percent more seats than it has during the winter. Besides the 10 aircraft returning to the skies, Lufthansa said that it would introduce two new Airbus A-340 jets that were ordered before Sept. 11. It also is opening routes in May from Munich to Boston, Tokyo and Shanghai. "If the market livens up further, we will react flexibly and adjust our capacity again if necessary," Lufthansa sales manager Thierry Antinori said in a statement. Earlier this month Lufthansa, Germany's largest airline, reported a net loss of 591 million euros ($516 million) for 2001, saying it was hurt by a weak global economy and the Sept. 11 terrorist attacks. That followed a 2000 net profit of 689 million euros. © 2002 The Associated Press