Orbital ATK [OA] for a second time has delayed its re-engined Antares return to flight, this time targeting the second half of September, according to company COO Blake Larson.The company previously pushed back its Antares return to flight from July to August. Larson, in a conference call with investors Wednesday, blamed a variety of interrelated factors, including Orbital ATK’s continued processing, inspection and testing of the flight vehicle at the Wallops Island Flight Facility, Va., launch site. He also cited…