B-2 Spirit Introduction

The B-2 Spirit, sometimes known as the B-2 Bomber, or The Boomerang, is an American multi-role stealth bomber capable of delivering both conventional and nuclear weapons. A dramatic leap forward in technology, the bomber represented a major milestone in the U.S. bomber modernization program. The B-2 is the most expensive plane ever built. Estimates for the costs per plane range from $2.2 billion USD [1] to $1.157 billion USD [2] (and see Trivia,below). Questions remain over the ongoing and escalating cost of the program [3]. Some writers have suggested that the huge program cost may actually include costs for other black projects that remain classified. The high per-unit cost may also be partially explained by the small number of planes produced coupled with a large research overhead in the B-2 program.

Source: Wikipedia.org