The EUROCONTROL Performance Review Commission (PRC) has published its nineteenth ATM Cost-Effectiveness (ACE) Benchmarking Report. This report was produced during an exceptional period for the aviation industry, which was marked by the COVID-19 outbreak. It provides both a detailed analysis of ANSPs cost-effectiveness performance just before the start of the pandemic and an initial examination of how ANSPs responded to mitigate the short-term consequences of this unprecedented crisis.