Question: Martinair Flight 138 was operated on behalf of a national airline headquartered in what city?
Context: Martinair Flight 495 was a McDonnell Douglas DC-10 operated by Dutch airline Martinair, that crash-landed in severe weather conditions at Faro Airport, Portugal, on 21 December 1992.  The aircraft carried 13 crew members and 327 passengers, mainly holidaymakers from the Netherlands.  54 passengers and 2 crew members died and 106 of the other occupants were badly injured. Air Ivoire was an airline headquartered in the "Immueble EECI" in Abidjan, Côte d'Ivoire.  It was the national airline and operated scheduled regional and intercontinental services.  Its main base was Port Bouet Airport, Abidjan.  The airline ceased operations in 2011. Martinair Flight 138 was a chartered flight from Surabaya, Indonesia to Colombo, Sri Lanka.  The aircraft was operated on behalf of Garuda Indonesia.  On 4 December 1974, the aircraft, a McDonnell Douglas DC-8-55CF, crashed into a mountain shortly before landing, killing all 191 people aboard – 182 Indonesian hajj pilgrims bound for Mecca, and 9 crew members. Loftleiðir HF LL 001, a charter flight, crashed on November 15, 1978 on approach just short of the runway at the international airport of Colombo, Sri Lanka.  The Douglas DC-8 crash killed 8 of the 13 Icelandic crew members, 5 reserve crew members and 170 (mostly Indonesian) Muslim pilgrims from South Borneo, out of a total of 262 passengers and crew.  The official report by Sri Lankan authorities gave the probable cause of the crash as being failure of the crew to conform to approach procedures; however U.S. and Icelandic authorities officially claim faulty equipment at the airport and air traffic control error as the cause of the crash.  It is by far the worst crash in Icelandic aviation history and the second worst in Sri Lankan aviation history after Martinair Flight 138 that crashed four years before. Martinair, legally "Martinair Holland N.V.", is a Dutch cargo airline headquartered and based at Amsterdam Airport Schiphol and a subsidiary of Air France-KLM.  The airline was founded in 1958 by Martin Schröder.  Since 2011, Martinair has operated entirely as a cargo airline with scheduled services to 20 destinations worldwide and additional charter flights.  Prior to that date, passenger flights were also operated. Garuda Indonesia (PT Garuda Indonesia (Persero) Tbk ) is the national airline of Indonesia.  Named after the holy bird Garuda of Hinduism from the national emblem of Indonesia, the airline is headquartered at Soekarno–Hatta International Airport in Tangerang, near Jakarta.  As of 11 December 2014, the airline is rated as a 5-star airline by the international airline review firm Skytrax.  The air carrier was previously known as Garuda Indonesian Airways. Air Costa was an Indian regional airline headquartered in Vijayawada and based out of Chennai Airport.  It was owned by Indian business company LEPL Group.  The airline commenced operations as a regional airline in October 2013 using two Embraer E-170 aircraft with the first flight taking off from Chennai on 16 October 2013.  The airline got a permit for pan India operations in October 2016.  The airline focused on connectivity between tier II and tier III cities in the country and invested as of 2015.  Air Costa operated 32 daily flights to nine destinations from its focus cities Chennai and Vijayawada as of 2015.  The airline had a maintenance center in Chennai.  On 28 February 2017, it suspended operations until further notice. Bahamasair Holdings Limited, is an airline headquartered in Nassau.  It is the national airline of the Bahamas and operates scheduled services to 32 domestic and regional destinations in the Caribbean and the United States from its base at Lynden Pindling International Airport. Luxair Flight 9642 was a scheduled international passenger flight flying from Berlin Tempelhof Airport, Germany, to Luxembourg Findel Airport, Luxembourg.  The flight carried 19 passengers and 3 crew members.  The flight was operated by Luxair, the flag carrier (national airline) of Luxembourg.  The plane was a Fokker 50 and registered as LX-LGB.  Lufthansa had a codeshare on the flight as LH2420.  On 6 November 2002, the flight crashed while on final approach to Luxembourg Findel Airport about 6 nautical miles (11 km) short of the runway while trying to land in fog.  20 out of the 22 passengers and crew perished Maskeliya is a town in the Central Province of Sri Lanka.  It is the site of the 1974 crash of Martinair Flight 138, the worst air disaster in Sri Lanka.
Answer: Tangerang