Skyguide managed and monitored 270 610 flights under instrument flight rules (IFR) in the first half of 2020. This represents a year-on-year decline of 57.1%, most of which occurred in March, April and May. Air traffic in the airspace above Switzerland and in the delegated areas managed by skyguide came to a virtual standstill at times after the coronavirus crisis that reached Europe in March 2020 severely restricted air traffic. 98.3% of all flights handled by skyguide were punctual.
Full story: https://www.skyguide.ch/en/historischer-verkehrseinbruch-aufgrund-der-weltweiten-corona-krise/