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In this paper, we explore the strong potential of Network Function Virtualization (NFV) technologies to enable multi-mission small unmanned aircraft systems. In this context, we analyze the main challenges of using NFV technologies in this emergent field, and we present the design of an NFV system that supports the flexible, automated and cost-effective deployment of network services over small unmanned aerial vehicles. To validate our design, we implemented its most relevant components with open-source technologies, using this first prototype of the system to carry out a set of preliminary experiments that showcase its feasibility and functionality.