Boeing Co. has pushed back the first flight of its 787 Dreamliner twin-aisle jet into the second quarter of 2009. The company blamed the delay on a recent strike by the machinists union and on the need to replace certain fasteners in early-production airplanes. Just prior to the strike, Boeing had planned to put the 787 into the air for flight testing by the end of 2008, with first deliveries slated for third quarter 2009. First deliveries are now expected in first quarter 2010. This is the fifth delay announced by Boeing, putting the 787 program about two years behind the originally announced schedule.