Ministers have been urged to scrap the multi-billion-pound Joint Strike Fighter project unless the US agrees to share its sensitive technological specifications.
Sky Defence Correspondent Geoff Meade says the UK badly needs a replacement for the ageing Harrier - whatever it gets called.
Although the Falklands veteran jump jet has proved valuable beyond its years, flying mission after mission in support of ground troops in Afghanistan, the fierce tempo of operations is taking a toll on the lifespan of ageing airframes.
The problem is nobody knows yet if the new US-designed jet will be bought, or even what it will be called.
America designates it the F35, Lightening Two and Joint Strike Fighter. Britain prefers Joint Combat Aircraft. For simplicity why not name it the New Harrier?
We are starting to sound like a stuck record. I thought this was sorted in August.