US Airways will start service between Philadelphia and London Heathrow on March 29. Tickets will be available for purchase on December 1. Flights will depart Philadelphia at 10:45 p.m. and arrive in London at 11:05 a.m. the next day. Return flights depart London at 12:50 p.m. and arrive in Philadelphia at 4 p.m. Service will be operated by US Airway's flagship international aircraft, the Airbus A330, which has 29 business-class seats and 259 economy seats. Visit www.usairways.com. (JM)