Two more men have been charged in connection with the alleged plot to blow up transatlantic airliners.
The security alert caused major disruption at UK airports
Don Stewart Whyte, of High Wycombe, Bucks, and Mohammed Usman Saddique, of Walthamstow, east London, are charged with preparing acts of terrorism.
Mr Stewart Whyte also faces three firearm charges. Three others being questioned over the alleged plot have been released without charge.
Seventeen people have now been charged following arrests made in August.
Mr Stewart Whyte and Mr Saddique were charged by officers at Belgravia police station in London and will appear at City of Westminster Magistrates Court on Thursday morning.
The terrorism charge against both men alleges that between 1 January and 10 August 2006 with the intention of committing acts of terrorism, they were preparing to smuggle parts of improvised explosive devices onto aircraft and assemble and detonate them on board.
The firearms charges against Mr Stewart Whyte allege that on 9 August he had in his possession a Baikal 8mm pistol.
He is also charged with possessing a magazine clip with 10 rounds of ammunition and possessing a black gun silencer without holding a firearms certificate.
The plot is alleged to have involved smuggling improvised explosives onto US-bound jets from London, where they would have been assembled and detonated on board.