From the footer: Data based on information by ELFAA "Variations in Airport Charges", Jan Skeels - Secretary General, Aviation Industry Group - 2nd Annual Managi

From the footer: Data based on information by ELFAA "Variations in Airport Charges", Jan Skeels - Secretary General, Aviation Industry Group - 2nd Annual Managing Airline Operating Costs Conference, Dublin 7 December 2005 Also see http://bib.irb.hr/datoteka/260325.ICTS_06_vidovic.pdf http://bib.irb.hr/datoteka/260325.ICTS_06_vidovic.pdf , which uses the same source (among others) and goes into greater detail than the image. Also note that "Cheaper airports / landing fees" was calculated in the image to amount to 6% of the savings of LFAs. Only covering certain high traffic routes is a good point, and doesn't seem to be mentioned.