[1]Fraport AG — Betriebsberichte Frankfurt Airport (2022–2024)
[2]Flughafen München GmbH — MUC Facts & Figures 2023
[3]IATA — Passenger Experience Research 2023
[4]ACI World — Airport Service Quality Report 2023
[5]BDL — Luftverkehrsbericht 2023
[6]Airline Ground Handling Reports
[7]IATA — Group Travel Handling Guidelines & Fraport Gruppenabfertigung (2023)