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Nowadays aerospace enterprises have a variety of Information Systems (IS) and Software Complexes (SC). Their strategic aim is to integrate all IS and SC, thus to create the Single Information Space (SIS). An approach to create the SIS based on a Service Oriented Architecture (SOA) concept at aerospace enterprises is suggested. It was shown that different tools to implement this approach are available. The SOA model of the SIS of the typical enterprise, which has a custom set of services, IS and SC, was developed. Two modifications of this SOA model are proposed. The first modification is suitable for creation of the SIS on enterprises which have Business Intelligence (BI) systems based on Data Warehouse (DW). Another modification of the SOA-based SIS is important for those enterprises which require to process at least the part of technological and manufacturing data in a real-time mode.