M]odelling and simulation sit uncomfortably in science both socially and epistemically, because of the boundaries they cross. '' Sismondo (1999, page 247) 1 Introduction On 2 November 2006 the United States Air Force launched Cyberspace Command.Complementing their existing Air Combat and Space Command, the new Command facility sought to establish and preserve not only``freedom of access and commerce in air [and] space'', (1) but also cyberspace. The increasing use of such networked battle simulations by military forces means that the ability to`fly' and fight' is increasingly being taught in a virtual realm, and code has become a medium through which aerially mobile objects and forces are structured, trained, and coordinated. For the US and other armed forces, computer code, and the infrastructure that carries it, has become a new territorial space whose exploitation enables them to achieve`full spectrum' dominance (Graham, 2004;Weizmann, 2002). (2) Cyberspace, not real space, has become the new territorial`high ground'. (3) The importance of computer code to commercial aviation is similarly evident. From the check-in desk to the flightdeck, aeromobile objects and bodies are screened, sorted, and monitored by a labyrinth of networked computer systems. For the most part, these systems are taken for granted and our dependence on them only revealed when a computer breakdown at air traffic control grounds flights or a malfunctioning baggage system misroutes luggage.