Aircraft or spacecraft, comprising: a data network which has electronic systems (12-1 - 12-n); and a server system comprising: an integration system which has at least two server modules (3-1 - 3-n) which have in each case at least one program-controlled arithmetic-logic means, at least one memory which is coupled with the program-controlled arithmetic-logic means, and at least one communication interface which is coupled with the program-controlled arithmetic-logic means; at least one data line which interconnects the two server modules (3-1 - 3-n) for data communication by the communication interfaces thereof; and a server interface coupled to the at least one data line and being configured to connect the integration system to the data network for data communication by the communication interfaces of the server modules (3-1 - 3-n); the aircraft or spacecraft being characterized in that the integration system is configured to exchange data with the data network via the server interface and to combine the server modules (3-1 - 3-n) to form a virtual server, which is implemented distributed over the individual server modules (3-1 - 3-n); and in that the server modules (3-1 - 3-n) are arranged in the different electronic systems (12-1 - 12-n) of the data network. a data network which has electronic systems (12-1 - 12-n); and a server system comprising: an integration system which has at least two server modules (3-1 - 3-n) which have in each case at least one program-controlled arithmetic-logic means, at least one memory which is coupled with the program-controlled arithmetic-logic means, and at least one communication interface which is coupled with the program-controlled arithmetic-logic means; at least one data line which interconnects the two server modules (3-1 - 3-n) for data communication by the communication interfaces thereof; and a server interface coupled to the at least one data line and being configured to connect the integration system to the data network for data communication by the communication interfaces of the server modules (3-1 - 3-n); the aircraft or spacecraft being characterized in that the integration system is configured to exchange data with the data network via the server interface and to combine the server modules (3-1 - 3-n) to form a virtual server, which is implemented distributed over the individual server modules (3-1 - 3-n); and in that the server modules (3-1 - 3-n) are arranged in the different electronic systems (12-1 - 12-n) of the data network. an integration system which has at least two server modules (3-1 - 3-n) which have in each case at least one program-controlled arithmetic-logic means, at least one memory which is coupled with the program-controlled arithmetic-logic means, and at least one communication interface which is coupled with the program-controlled arithmetic-logic means; at least one data line which interconnects the two server modules (3-1 - 3-n) for data communication by the communication interfaces thereof; and a server interface coupled to the at least one data line and being configured to connect the integration system to the data network for data communication by the communication interfaces of the server modules (3-1 - 3-n); the aircraft or spacecraft being characterized in that the integration system is configured to exchange data with the data network via the server interface and to combine the server modules (3-1 - 3-n) to form a virtual server, which is implemented distributed over the individual server modules (3-1 - 3-n); and in that the server modules (3-1 - 3-n) are arranged in the different electronic systems (12-1 - 12-n) of the data network.