US Airways Group will offer nonstop flights to Anchorage, Alaska, next summer. It will be the only nonstop airline service to Alaska from the northeastern United States, the carrier said. The new route will be seasonal, operating from June 1 to Sept. 7, with a 4 p.m. daily departure, arriving at 7:40 p.m. Anchorage time. The return Anchorage flight will depart daily at 9 p.m., arriving at 8:01 the next day in Philadelphia. The route will be flown with Boeing 757 aircraft with 12 First Class seats and 164 seats in the main cabin. Passengers may begin booking Dec. 12.