At least six feared dead after plane crashes into heavily populated area of Philadelphia
The crash follows this week's collision of an American Airlines jet and a US Army Black Hawk helicopter over Washington DC which killed 67 in the nation's deadliest aviation disaster since 2001.
DC plane crash latest updates: Flight recorder 'black box' from army Black Hawk helicopter recovered from wreckage
Flight recorder 'black box' from army Black Hawk helicopter recovered from wreckage - None of the 67 passengers and crew are believed to have survived ...