Olympic Airlines (Greek: Ολυμπιακές Αερογραμμές , "Olympiakés Aerogrammés" – OA), formerly named Olympic Airways for at least four decades, was the flag carrier airline of Greece.
 The airline's head office was located in Athens.
 The airline operated services to 37 domestic destinations and to 32 destinations world-wide.
 The airline's 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.
JAL Express Co., Ltd. (JEX) (株式会社ジャル エクスプレス , Kabushiki-gaisha Jaru Ekusupuresu ) , was an airline with its headquarters at Tokyo International Airport and in Ota-ku, Tokyo, Japan, and its main hub at Tokyo International Airport.
 The airline also maintained offices in the Japan Airlines Building in Shinagawa, Tokyo.
 Its operations included scheduled and non-scheduled passenger services to eight regional destinations across Japan.
 In addition, the airline operated additional 15 destinations in Japan and two destinations in the People's Republic of China on behalf of Japan Airlines, under a wet-lease agreement.
Norwegian Air Shuttle ASA (), trading as Norwegian, is a Norwegian low-cost airline.
 It is the third largest low-cost carrier in Europe, the largest airline in Scandinavia, and the ninth-largest airline in Europe in terms of passenger numbers.
 It offers a high-frequency domestic flight schedule within Scandinavia and Finland, and to business destinations such as London, as well as to holiday destinations in the Mediterranean and the Canary Islands, transporting over 30 million people in 2016.
 The airline is known for its distinctive livery of white with a red nose, with portraits of distinguished Scandinavians on the tail fins of its aircraft.
Israeli airline Arkia operates scheduled services to the following destinations (as of March 2016).
 Some destinations will be served in the 2016 Summer schedule:
Aegean Airlines S.A. (Greek: Αεροπορία Αιγαίου Ανώνυμη Αεροπορική Εταιρεία , "Aeroporía Aigíou Anónime Etairía" ] ; ) is the largest Greek airline by total number of passengers carried, by number of destinations served and by fleet size.
 A Star Alliance member since June 2010, it operates scheduled and charter services from Athens and Thessaloniki to other major Greek destinations as well as to a number of European and Middle Eastern destinations.
 Its main hubs are Athens International Airport in Athens, Thessaloniki International Airport in Thessaloniki and Larnaca International Airport in Cyprus.
 It also uses other Greek airports as bases, some of which are seasonal.
 It has its head office in Kifisia, a suburb of Athens.
 Although the airline is the largest airline in Greece, it is not a flag carrier.
Tigerair Australia (known as Tiger Airways Australia until July 2013) is a low-cost airline based in Melbourne, Australia.
 As of March 2014, it operates to 12 destinations in six states and territories across Australia, with 2 more destinations, Darwin and Whitsunday Coast, to be available from April, 2014.
 Tigerair Australia has operated flights to 17 destinations in Australia, but the majority of these destinations were discontinued after the grounding of the airline's entire fleet by the Civil Aviation Safety Authority in July 2011.
Turkish Airlines (Turkish: "Türk Hava Yolları") () is the national flag carrier airline of Turkey, headquartered at the Turkish Airlines General Management Building on the grounds of Atatürk Airport in Yeşilköy, Bakırköy, Istanbul.
 s of 2017 , it operates scheduled services to 302 destinations in Europe, Asia, Africa, and the Americas, making it the fourth-largest carrier in the world by number of destinations.
 It serves more destinations non-stop from a single airport than any other airline in Europe.
 Turkish Airlines flies to 120 countries, more than any other airline.
 With an operational fleet of fourteen cargo aircraft, the airline's cargo division serves 64 destinations.
 Istanbul Atatürk Airport is its main base, and there are secondary hubs at Esenboğa International Airport, Sabiha Gökçen International Airport, and Adnan Menderes Airport.
 Turkish Airlines has been a member of the Star Alliance network since 1 April 2008.
As of March 2017, Austrian leisure airline Niki serves the following scheduled destinations.
Niki (also styled as NIKI or flyNiki, legally "NIKI Luftfahrt GmbH") is an Austrian low-cost airline headquartered in "Office Park I" at Vienna International Airport in Schwechat.
 It operates scheduled and charter services to European and North African leisure destinations from Vienna, Salzburg, Graz and Innsbruck and also started services from several German airports in March 2017.
Bahrain Air (Arabic: طيران البحرين‎ ‎ ) was an airline of the Kingdom of Bahrain, headquartered in the Mohamed Centre in Muharraq.
 Its main base was Bahrain International Airport.
 The airline flew to 16 destinations in the Middle East, Africa and South Asia.
 In earlier statements the airline planned to increase its destinations to 23 cities by 2009 and up to 25 cities by 2010.
 Prior to its voluntary liquidation in 2013, Bahrain Air flew to 17 destinations (flights to Alexandria were seasonal).
 In 2012, the airline complained via local media about the measures undertaken by the Minister of Transportation, also the competing airline Gulf Air's head of restructuring committee when the airline's route schedule and frequencies were reduced by up to 30% without prior notice.
 The airline, having sought every route possible to overcome the Minister's act of Conflict of Interest, declared bankruptcy on 12 February 2013.
 The airline complained of conflict of interest.

Question: When did the airline Niki schedule their destinations?
Answer: March 2017