It may be relevant to this discussion which seems to have broadened a little. I see the Australian government has just committed to a twenty years programme of continuous building for the Royal Australian Navy. This makes sense to me because, whether its aircraft, ships or anything else, it means expertise isn't lost, lessons don't have to be expensively re-learned and a whole body of knowledge is built up. If the Australians (21 million) can do this - why can't we think in these terms? There are after all a couple of smaller operations that could begin to work at a higher level in aircraft building/design - if the government wanted.