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ATFM window.
ATFM slot adherence
ATFM slot adherence measures the share of
take-offs outside the allocated ATFM
window.
An ATFM slot tolerance window (-5min
+10 min) is available to ATC to organise
the departure sequencing.
ATC at the departure airport has a joint
responsibility with aircraft operators to
depart within the allocated ATFM window
10.0% in order to avoid over-deliveries.
12.5%
15.0%
17.5%
20.0%
22.5%
25.0%
2003
2004
2005
2006
2007
2008
2009
% of take-offs outside the allocated ATFM
window
source: EUROCONTROL/ CFMU
Figure 51: ATFM slot adherence
PRR 2009 Chapter 4: Air Transport Network Performance
41
4.7.7 Figure 52 shows the proportion of ATFM regulated flights departing outside the ATFM
window at the top 20 airports in terms of movements in 2009.
4.7.8 The new Regulation (see paragraph 4.7.2) is expected to have a positive impact on ATFM
slot adherence which is addressed directly in Article 11. At airports where the share of
take-offs outside the ATFM slot window is 20% or higher, the respective ATS units have
to provide relevant information of non-compliance and the actions taken to ensure
adherence to ATFM slots.
0
10
20
30
40
50
60
70
80
Paris (CDG)
Frankfurt (FRA)
Amsterdam (AMS)
London (LHR)
Munich (MUC)
Madrid (MAD)
Zurich (ZRH)
Brussels (BRU)
Dusseldorf (DUS)
Copenhagen (CPH)
Vienna (VIE)
Barcelona (BCN)
London (LGW)
Milan (MXP)
Rome (FCO)
Stockholm (ARN)
Oslo (OSL)
Athens (ATH)
Paris (ORY)
ATFM regulated departures ('000)
0%
5%
10%
15%
20%
25%
30%
35%
40%
% outside ATFM window (-5/+10 min.)
Within ATFM slot window Early take off
Late take off % outside ATFM window Source: CFMU
Figure 52: ATFM slot adherence at airports
4.7.9 Figure 53 shows the percentage of ATFM delay due to inappropriate regulations between
2003 and 2009. On average almost 8% of the ATFM delay is not considered to be
necessary because there was no excess of demand. It reflects the fact that ANSPs tend to
publish “defensive” regulations in order to cope with potential over-deliveries due to nonadherence
to slots and flight plans.
4.7.10 Of similar importance for the network is the adherence to flight plans and initiatives to
better monitor and improve flight plan adherence should be further encouraged.
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
2003
2004
2005
2006
2007
2008
2009
% of ATFM delays due to inappropriate
regulations (no excess demand)
source: EUROCONTROL/ CFMU
Figure 53: Delay due to inappropriate ATFM regulations
Inappropriate ATFM
regulations
ATFM regulations are considered to
be inappropriate when there was no
excess of demand.
However, the decision to call for an
ATFM regulation depends on the level
of information available at the time
when the decision needs to be taken
(i.e. at least two hours before the
anticipated capacity shortfall to be
effective). Hence the accuracy of the
traffic and MET forecast two or more
hours before the actual event is crucial
for the decision making process and
should be improved as much as
possible.
PRR 2009 Chapter 4: Air Transport Network Performance
42
4.8 Conclusions
4.8.1 Virtually all performance indicators related to operational air transport performance show
a notable improvement in 2009.
4.8.2 The share of flights delayed by more than 15 minutes compared to schedule decreased
from 21.6% in 2008 to 17.9% in 2009. This needs to be seen in context with the
significant drop in traffic (-6.6%) which reduced traffic to 2006 levels.
4.8.3 The unprecedented drop in traffic reduced demand far below planned capacity levels in
2009. The resulting spare capacity in most areas (airlines, airports, ATC) translated into
better turnaround performance (airlines, airports, security, etc.), a reduction of ATFM enroute
delays and resulting positive effects for the network.
4.8.4 In 2009, ANS-related delays (including weather related delays handled by ANS)
accounted for some 25% of total departure delays, compared to 28% in 2008.
4.8.5 There is a high correlation between the ANS delays reported by airlines in CODA and the
ATFM delay calculated by the CFMU.
4.8.6 Although ATFM slot adherence shows a continuous improvement between 2003 and
　
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