MOST EXPENSIVE MILITARY PLANE EVER MADE: B-2 SPIRIT BOMBER, USA

The exuberant cost – US $2.2 billion per unit - of what went on to become the 'stealth bomber' forced the Congress to cut its purchase order from 132 to 21 in 1987. According to Northrop Grumman, the company responsible for manufacturing the B-2, its radar-cloaking technologies make it capable of penetrating the most sophisticated of the enemy defences.