on one side there were the members that believed that the use of aeroplanes as instruments of terror and destruction only further proved that vehicles merit to be worshipped ; they argued that , although the destruction of the twin towers of the world trade center was perhaps the most graphic example of an aircraft being used as an actual weapon , it was by no means the first occasion when that particular means of conveyance had been used against man - indeed , since the beginning of the twentieth century the skies had become the new arena of modern warfare : battles were no longer won on the ground , but instead in the air ; it was only necessary to consider perhaps the single most catastrophic action of man against man - the bombings of nagasaki and hiroshima at the end of the second world war - to see that the agent by which the nuclear devices were delivered was the transcendent aeroplane .