Causes influenceable by the air navigation services provider:
Causes beyond the influence of the air navigation services provider:
Air traffic flow management (ATFM) departure delays can occur whenever Eurocontrol’s Network Management Operations Centre (NMOC) predicts that the number of flights scheduled to use a particular sector of airspace during a particular period according to the flight plans submitted will exceed the sector’s capacity. In such an event, the NMOC will intervene to assign specific take-off slots to the individual flights concerned.
Despite the high numbers of flights it handled, skyguide saw only a slight decline in its punctuality in 2018, and 96.5% (prior year: 97%) of all flights were handled without delays. Skyguide thus met the requirements of the European Performance Plan. Average en-route delays per flight increased from the 10.1 seconds of 2017 to 17.1 seconds. These delays were attributable primarily to adverse weather conditions (41%), capacity shortages (39%) and staff absences through sickness (17%).
The reasons for the majority of delays are outside air navigation services’ control. The main causes of the delays at Geneva Airport, which were up 27.9%, were adverse weather (55%), insufficient landing runway capacity (20%), illness-related staff absences (19%) and insufficient approach capacity (3%). The prime reasons for the delays in Zurich, which were up 15.2%, were also adverse weather (56%) and insufficient landing runway capacity (18%), along with environmental constraints (13%) and insufficient approach capacity (10%).
Countering en-route delays
En-route air traffic saw an 82% increase in delays Europe-wide in 2018, largely as a result of external factors. The reasons were:
Skyguide has taken actions to increase its system capacities:
Skyguide not only demonstrates its performance capabilities to its owners and customers in Switzerland. Since 2012, it has also been required to do so towards the European Commission. And at the end of 2014, the Commission set a series of performance criteria for the 2015-2019 reference period, in consultation with skyguide and the Swiss Federal Office of Civil Aviation (FOCA). The criteria defined by the European Commission prompted controversy within Europe: companies that are as regulated as air navigation services providers are find it difficult to reduce costs, simultaneously invest in new technologies and achieve the targets of the European Performance Plan.