The program was to develop and field a replacement for the A-6 Intruder by 1994.

It was time to develop a replacement for the venerable 645 engine which, in its earlier 16-645E form, had proved to be exceptionally reliable.

That program, and the need to keep the space shuttle flying and develop a replacement for it, are causing the shortfall.

When these imports ceased, he developed a successful replacement - ironstone china - which was then exported to other countries.

In this way planned obsolescence may be introduced without the company going to the expense of developing a "more up to date" replacement model.

Work on the Virginia was started in 1920, with the aim of developing a replacement for the Vimy.

Once the Stuka became too vulnerable to fighter opposition on all fronts, work was done to develop a replacement.

That will buy at least a decade's time to develop a replacement.

The Army Technical Bureau was assigned a project to develop a replacement in 1931.

Other money earmarked for developing a replacement will now go to upgrading the shuttles so that they can keep flying until at least 2015.