COMET, a Clean Sky 2 (CS2) Joint Undertaking project, addresses the challenge of designing, developing, and testing novel dual ACARS-IPS cockpit and future ground network infrastructures operating in a multi-link environment (e.g. VDL2, Swift broadband SATCOM, AeroMACS and LDACS) to enable seamless air-to-ground connectivity in support of trajectory-based ATC operations and future airline services. This paper presents SDN-based approaches in the network design and preliminary analysis that have been carried out within the project.