Air traffic management (ATM) is a vital part of air transport and aviation. However, ATM is fragmented in Europe. A promising way to improve air traffic operations is through the use of 4D trajectory management (TM). The EU-funded PJ18-W2 4D Skyways project aims to continue research conducted to date on TM in order to enable the deployment of trajectory-based operations under a single European sky. With this goal in mind, it intends to deliver mature TM operational improvements and work on establishing a consolidated TM solution that will address Europe's ATM fragmentation. The project's achievements lead to better ATM that will benefit airlines flying in Europe.