1. Abate M (2016) Economic effects of air transport market liberalization in Africa. Transp Res Part a: Policy Practice 92:326–337
2. Africa Development Bank (2019) Framework and guidelines to support the aviation sector. Available at: www.afdb.org
3. Aigner D, Lovell CAK, Schmidt P (1977) Formulation and estimation of stochastic frontier production function models. J Econ 6(1):21–37
4. Aigner DJ, Chu SF (1968) On estimating the industry production function. Am Econ Rev 58(4):826–839
5. Air Transport Action Group (2018) Aviation benefits beyond borders. Available at: www.atag.org