Task: Question Answering
Input (English): Context: Olympic Air S.A. is a regional airline, a subsidiary of the Greek airline carrier Aegean Airlines. It was initially formed from the privatization of the former Greek national carrier Olympic Airlines, a company that carried the name Olympic Airways from 1957 to the beginning of the 21st century. Olympic Air commenced limited operations on 29 September 2009, after Olympic Airlines ceased all operations, with the official full-scale opening of the company taking place two days later on 1 October 2009. Its main hub is Athens International Airport, with Rhodes International Airport serving as secondary hub. The airline's headquarters are in Building 57 at Athens International Airport in Spata, and its registered seat is in Koropi, Kropia, East Attica., Macedonian Airlines ( , transliterated Makedonikes Aerogrammes ) was a subsidiary of Olympic Airways , the former national flag carrier of Greece . The company ceased operations in 2003 , when it took over the operations of Olympic Airways and was renamed Olympic Airlines ., Olympic Airlines ("Olympiakés Aerogrammés"  OA), formerly named Olympic Airways for at least four decades, was the flag carrier airline of Greece with their head office in Athens. They operated services to 37 domestic destinations and to 32 destinations world-wide. Their main base was at Athens International Airport, with hubs at Thessaloniki International Airport, "Macedonia", Heraklion International Airport, "Nikos Kazantzakis" and Rhodes International Airport, "Diagoras". Olympic Airlines also owned a base at London Heathrow International Airport. By December 2007, the airline employed about 8,500 staff., Athens International Airport "Eleftherios Venizelos" ("Diethnís Aeroliménas Athinón "Elefthérios Venizélos"") , commonly initialized as "AIA", began operation on 28 March 2001 and is the primary international airport that serves the city of Athens and the region of Attica. It is Greece's busiest airport and it serves as the hub and main base of Aegean Airlines as well as other Greek airlines. The airport is currently in Group 2 of Airports Council International (10-25 million) and as of 2016, Athens International is the 28th busiest airport in Europe., Subject: macedonian airlines, Relation: airline_hub, Options: (A) athens international airport (B) thessaloniki international airport
Output (English): athens international airport