... correspondence: Aer Lingus, Aeroflot, Air Berlin, Air Malta, Air France, Air Scotland, Alitalia, Austrian, bmi, British Airways, Brussels, Bulgaria Air, Condor, Croatia Airlines, Cyprus Airways, Czech Airlines, ... data analysis and inter-pretation of the data as well as the writing of the manuscript.FGB participated in the data analysis and interpretation of thestudy. DS participated in the data analysis, ... frequently. A variety of low-cost carriers havemade air-travel accessible to a larger portion of the population,contributing to increasing passenger load. Additionally, theaverage passenger age...