Paris Orly has two terminals the South and West Terminals (Terminal Sud and Terminal Ouest). Both are roughly the same size. There is no logic behind the airline assignment so you would need to check your ticket carefully to which terminal you need to go. Here are the more popular airlines: Air France, BA, Aeroflot and EasyJet are in Terminal Sud. Transavia, Icelandic, Tui and Norwegian Air shuttle are in Terminal Ouest. Both terminals are connected by the free Orlyval automatic shuttle train.