F-35 demonstrates short take-off and landing capability
11 February 2014 Last updated at 16:45 GMT
The UK is about to commit to the F-35 fighter project, a US-led effort to produce 3,000 aircraft which is set to cost more than £600bn globally.
The initial UK order for 14 F-35Bs will, with support costs added, cost about £2.5bn, Newsnight has learned.
Defence Secretary Philip Hammond said it was an expensive plane, but one with an "incredible capability".
But critics have questioned Ministry of Defence suggestions that the jets will be combat capable by 2018.
Watch an F-35B warplane demonstrate its short take-off and vertical landing capability.