Aena SME SA, formerly Aena SA, is a Spain-based company primarily engaged in the airports operation. Its activities are divided into four segments: Airports, which comprises Aeronautical subdivision, responsible for the management of airports, jetways, security, handling, cargo and fuel services, among others, as well as Commercial subdivision, including duty-free and specialty stores, restaurant services, car rental, as well as banking services and advertising; Services outside the terminal, which manages real estate assets, such as parking lots, warehouses and lands; International, which comprises operations of Company's subsidiary, Aena Desarrollo Internacional SA, that invests in other airport owners principally in Mexico, Colombia and the United Kingdom; and Others, encompassing corporate activities. It manages tourism, hub and regional airports, as well as heliports and general aviation areas. Furthermore, its destination range comprises Europe, the Americas, Asia and Africa.

Aeroports de Paris is the airport authority that owns and manages the fourteen civil airports and airfields in the Ile-de-France (Paris) area. Co. owns and operates the three main airports of the Ile de France region (Paris-Charles de Gaulle, Paris-Orly and Paris-Le Bourget), 10 general aviation airfields and the Issy-les-Moulineaux heliport. In the three main airports, Co. provides facilities to accommodate passengers, airlines and cargo and postal services, and offers a range of services. Co.'s activities are divided into five business segments: Aviation, Retail and Services, Real Estate, Airport Investments and Other Activities.

Air France-KLM is a holding company. Through its subsidiaries, Co. is engaged in transporting passengers and cargo, aeronautics maintenance and other air-transport related activities, including catering and charter services. Co. operates in six geographical regions: Metropolitan France; Europe (except France) and North Africa; Caribbean, French Guiana and Indian Ocean; Africa, Middle East; Americas, Polynesia; and Asia and New Caledonia. Co. organizes its business around the following four segments: Passenger, providing passenger transportation services on scheduled flights; Cargo, transporting freight on flights and selling cargo capacity to third parties; Maintenance, and Other activities.

Deutsche Lufthansa is an aviation group based in Germany. Co. maintains global operations and a total of more than 500 subsidiaries and associated companies. Co. operates in five major business segments: scheduled passenger air traffic ("Passenger Airline Group"); scheduled airfreight services ("Logistics"); maintenance, repair and overhaul ("MRO"); information technology ("IT Services") and catering ("Catering").

EasyJet and its subsidiaries are a low-cost airline carrier operating principally in Europe. Co. operates in the European short-haul aviation market. As of Sept 30 2017, Co. operated 862 routes. Co.'s total fleet as at Sept 30 2017, comprised 279 aircraft, split between 156-seat Airbus A319s, 180-seat A320s, 186-seat A320s and 186-seat A320neos. Co.'s main markets are the U.K., France, Italy, Switzerland, Germany, Netherlands, Portugal and Spain.

Fraport AG Frankfurt Airport Services Worldwide is an airport operator. Co. is divided into four segments: aviation, which includes airside and terminal management as well as corporate safety and security at the Frankfurt site; retail and real estate, which consists of retailing activities, parking facility and real estate management at Frankfurt Airport; ground handling, which comprises services dealing with passengers, aircraft and cargo; and external activities and services, which comprises Co.'s companies outside the Frankfurt site and auxiliary services in Frankfurt, including information technology and facility management in particular.

International Airlines Group is an international scheduled airline and global premium airlines. Co.'s principal place of business is London with significant presence at Heathrow, Gatwick and London City airports.

Ryanair Holdings is a holding company. Through its subsidiaries, Co. operates an ultra-low cost, scheduled-passenger airline serving short-haul, point-to-point routes between Ireland, the U.K., Continental Europe, and Morocco. Co. offers over 2,000 scheduled short-haul flights per day serving approximately 210 airports throughout Europe, and flying approximately 1,600 routes. In addition, Co. provides various ancillary services and engages in other activities connected with its core air passenger service, including non-flight scheduled services, Internet-related services, and the in-flight sale of beverages, food, and merchandise.

Wizz Air Holding is a European airline. As of Mar 31 2017, Co. provided more than 500 routes from 28 bases, connecting 141 destinations across 42 countries. Co. has two reportable segments: the airline and the tour operator business units, marketed under the Wizz Air and Wizz Tours brand names, respectively. Wizz Air sells flight tickets and related services to external customers and, to an extent, to Wizz Tours. Wizz Tours sells travel packages to external customers covering the network of Wizz Air.