The proactive involvement of AUs in the ATFCM process would allow them more flexibility to adapt the operations in a more cost/efficient manner and in line with their business-driven schedule priorities. The CADENZA project developed a new concept of operations that modifies the current responsibilities of the main ATFCM stakeholders and the charging scheme. The NM offers a discount on the ANSP charges if an AUs agrees ex ante that a specific flight might be delayed or re-routed within certain margins if this is beneficial from a network perspective. The larger the margins, the higher the discount. However, the NM will only impose the minimum delay or re-routing that is necessary for achieving the network optimum. In order to better understand the determinants of AUs when deciding on trajectory products, and as an input to a choice model, the authors performed a stated preference study.