European Airspace (De)Fragmentation Assessment Model

  • Zvonimir Rezo Croatian Academy of Sciences and Arts, Traffic Institute
  • Sanja Steiner University of Zagreb, Faculty of Transport and Traffic Sciences
  • Tomislav Mihetec Croatia Control Ltd.
Keywords: Air Traffic Management, airspace, fragmentation, performance-based airspace model


Airspace fragmentation represents an issue that began to be more frequently mentioned within the Air Traffic Management (ATM) domain in the last two decades. Primarily, it is frequently listed as one of the main causes contributing to inefficiency of the ATM system in Europe. However, even though the issue of the European airspace fragmentation has been recognized back in the 1990s, over the past decades it has neither been frequently studied nor comprehensively addressed. Accordingly, minor progress has been made to describe this issue in more depth. Therefore, this research paper deals with the research of performance-based airspace fragmentation (one of several European airspace fragmentation types). It presents the conceptual and methodological framework of a novel model that can be used to obtain answers to hypothetical questions of where, when, how, and whether it is possible to achieve performance-based airspace defragmentation. Accordingly, it is expected that further studies of the developed model will deliver relevant information that may contribute to a more inclusive, smart, and spatially oriented development of the ATM system in Europe.


Kawagoe M. Air Transport Deregulation in the EU: Study from the Europeanization Perspective. Proceedings of the Symposium on European Integration between the Past and the Present, 6 September 2008, Sapporo, Japan. 2008. p. 161-180.

European Court of Auditors. Single European Sky: A changed culture but not a single sky. Luxembourg: European Union; 2017.

Nava-Gaxiola C, Barrado C. Performance measures of the SESAR Southwest functional airspace block. Journal of Air Transport Management. 2016;50: 21-29.

European Commission. Air Traffic Management – Freeing Europe’s airspace. Brussels, Belgium; 1996.

Rezo Z, Steiner S. European Airspace Fragmentation Typology. International Journal for Traffic and Transport Engineering. 2020;10(1): 15-30.

Matsoukis E, Poulimenakos S. Air traffic management in the South East European countries. Current situation and prospects. European Transport. 2007;37: 16-34.

Grebenšek A, Magister T. Traffic variability in benchmarking of Air Navigation Service Providers cost-effectiveness. International Journal for Traffic and Transport Engineering. 2012;2(3): 185-201.

European Commission. An Aviation Strategy for Europe. Brussels, Belgium; 2015.

European Commission. Aviation: Open and Connected Europe. Brussels, Belgium; 2017.

Biggs RS, Garson GD. Analytic Mapping and Geographic Databases. Newbury Park, CA: Sage Publications Inc.; 1992.

Franklin C, Hane P. An introduction to GIS: Linking maps to databases. Database. 1992;15(2): 17-22.

Fricke H. Impact of Fragmentation on ATM System Performance. Proceedings of Research Workshop Fragmentation in Air Traffic and its Impact on ATM Performance, 14-15 May 2019 Budapest, Hungary; 2019. p. 6-12.

Anton R, Lokman N, Pitton E, Whittome M. Is fragmentation a sin?. Proceedings of Research Workshop Fragmentation in Air Traffic and its Impact on ATM Performance, 14-15 May 2019 Budapest, Hungary; 2019. p. 14-22.

Standfuß T, Fichert F, Schultz M, Stratis P. Efficiency losses through fragmentation? Scale effects in European ANS provision. Proceedings of Research Workshop Fragmentation in Air Traffic and its Impact on ATM Performance, 14-15 May 2019 Budapest, Hungary; 2019. p. 57-65.

Pavlović G, Fichert F. Effects of fragmentation on route charges - status quo analysis and potential alternatives. Proceedings of Research Workshop Fragmentation in Air Traffic and its Impact on ATM Performance, 14-15 May 2019 Budapest, Hungary; 2019. p. 117-124.

European Commission. Commission Implementing Decision (EU) 2019/903 of 29 May 2019 setting the Union-wide performance targets for the air traffic management network for the third reference period starting on 1 January 2020 and ending on 31 December 2024. Brussels, Belgium; 2019.

EUROCONTROL. Final data for the establishment of the cost-base and unit rates. Brussels, Belgium; 2019.

Performance Review Unit Database. Available from: [cited 7th May 2020].

Bailey T, Gatrell AC. Interactive spatial data analysis. Harlow, Longman; 1995.

Anselin L. Exploratory spatial data analysis in a geocomputational environment. In: Longley PA, Brooks SM, McDonnell R, Macmillan B. (eds.) Geocomputation, a primer. New York: Wiley; 1998.

EUROCONTROL. Local Single Sky implementation monitoring (LSSIP). Available from: [cited 2nd May 2020].

Button K, Neiva R. Spatial autocorrelation in the European air navigation system. Applied Economics Letters. 2013:20(15): 1431-1434.

Goodchild M. Spatial Autocorrelation. Norwich, UK: Geo Books; 1986.

Moran PAP. The interpretation of statistical maps. Journal of the Royal Statistics Society, Series B. 1948;10(2): 243-251.

Moran PAP. Notes on continuous stochastic phenomena. Biometrika. 1950;37: 17-23.

European Commission. Commission Regulation (EU) No 73/2010 of 26 January 2010 laying down requirements on the quality of aeronautical data and aeronautical information for the single European sky. Brussels, Belgium; 2010.

EUROCONTROL. Guidelines for Supporting the Implementation of Commission Regulation (EU) 73/2010. Brussels, Belgium; 2017.

Murgante B, Rotondo F. A Geostatistical Approach to Measure Shrinking Cities: The Case of Taranto. In: Montrone S, Perchinunno P. (eds). Statistical Methods for Spatial Planning and Monitoring. Springer-Verlag Italia; 2013.

Le Gallo J, Ertur C. Exploratory spatial data analysis of the distribution of regional per capita GDP in Europe, 1980-1995. Papers in Regional Science. 2003;85: 175-201.

Audretsch DB, Feldman MP. Knowledge Spillovers and the Geography of Innovation. Handbook of Regional and Urban Economics. Amsterdam, Netherlands; 2004.

Rezo Z, Steiner S. South East Common Sky Initiative Free Route Airspace – Implementation aftermath. Transportation Research Procedia. 2020;45: 676-683.

Steiner S, Mihetec T, Rezo Z. Resolution of operational constraints imposed by fragmentation of European airspace. Proceedings of International Scientific Conference: Science and Traffic Development, 9-10 May 2019, Opatija, Croatia. 2019. p. 385-395.

EUROCONTROL. Challenges of Air Transport 2030: Survey of experts’ views. Brussels, Belgium; 2009.

How to Cite
Rezo Z, Steiner S, Mihetec T. European Airspace (De)Fragmentation Assessment Model. Promet - Traffic&Transportation. 2021;33(2):309-18. DOI: 10.7307/ptt.v33i2.3645