Today I went spotting at KPHL (Philadelphia International) and I finally caught a 747! It was a British Airways 747-400.
British Airways used to fly twice daily from LHR-PHL operating a 777-200ER(BAW66) and 787-9 Dreamliner(BAW68). British Airways gave flight 68 to American Airlines its alliance partner which is now AAL728 operated on a A330-300. In response to losing a flight they upgraded to a 747-400 and departs daily at 6:40pmEST.
This is the one of the 747s that fly to PHL. Around Christmas Kallita Cargo operates a 747 for FedEx, and Lufthansa used to fly a 747 from FRA but was switched to a A340-500, then -300 and is now operated by Lufthansa CityLine on a A340-300.
(sorry for the bad quality)