As part of their air policing activities, the air force checks that the flight routes of foreign government aircraft flying over Switzerland correspond with the diplomatic clearance they have been given. Such missions are called "live missions".
Air policing missions carried out to assist civilian aircraft or in response to serious violations of air sovereignty or air traffic rules are called "hot missions".
The air policing capability is currently being expanded with the aim of having two armed combat aircraft ready for operations round the clock, 365 days a year, by the end of 2020.
Air policing missions are usually carried out from Payerne Air Base, but in the event of adverse weather conditions or a runway closure, aircraft take off from Meiringen or Emmen air bases.