Question:  Social seating is currently available with a few airlines, notably the flag carrier airline of the Netherlands whose hub is located where?

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Cambodia Angkor Air: Cambodia Angkor Air (Khmer: កម្ពុជា អង្គរ អ៊ែរ ) is the national flag carrier airline of Cambodia, with its corporate headquarters and main hub in Phnom Penh.  It commenced operations on the 28 of July 2009.  The airline was established as a joint venture by the Cambodian government (51%) and Vietnam Airlines (49%), the latter allowing for codeshare flights.  All of its fleet and most of its staff are leased from Vietnam Airlines.

Turkish Airlines: 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.

Olympic Airlines: 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.

KLM: KLM Royal Dutch Airlines, legally "Koninklijke Luchtvaart Maatschappij N.V.", is the flag carrier airline of the Netherlands.  KLM is headquartered in Amstelveen, with its hub at nearby Amsterdam Airport Schiphol.  It is part of the Air France–KLM group, and is a member of the SkyTeam airline alliance.  KLM was founded in 1919; it is the oldest airline in the world still operating under its original name and had 32,505 employees as of 2013 .  KLM operates scheduled passenger and cargo services to 145 destinations.

Malawian Airlines: Malawian Airlines Limited is the flag carrier airline of Malawi, based in Lilongwe and with its hub at Lilongwe International Airport.  It was established in 2012 after the liquidation of Air Malawi, the former national airline.  Ethiopian Airlines operates it under a management contract and owns 49% of the airline after it emerged as the winner following competitive bidding.

Social seating: Social Seating is a type of social networking service that allows users to choose their seatmates based on their personal preferences and social network profiles.  Social seating is a system that uses data from Facebook, LinkedIn, Twitter and other social networks, to allow users to look at people with similar interests and then book a seat accordingly.  Social seating is an opt-in system, meaning that passengers or clients of a service that implements a social seating program will not have their information pulled unless they willingly agree to it.  Social seating is currently available with a few airlines, notably KLM and Malaysia Airlines, and also for music events via Ticketmaster.

Air Nicaragua: Nicaragua Airways is the potential future national flag carrier of Nicaragua.  Its main base is Augusto C. Sandino International Airport, Managua.  It is the first time in 20 years that Nicaragua will have a national flag carrier, after Aeronica ceased operations in 1991.  Since then, the flag carrier status was awarded to Nicaragüense de Aviación also known as NICA Airlines.  Several airlines had tried to become the Nicaraguan flag carrier like CAAL (Central American Airlines), SANSA (Servicios Aereos Nicaraguenses S.A.) but none of these survived a year.  Today even NICA Airlines (6Y) is registered as the national airline of Nicaragua, the only international flight it operated once (Managua to Miami) and is done under the TACA code (TA) as a full TACA Airlines flight.

Air Mauritius: Air Mauritius Limited, operating as Air Mauritius, is the flag carrier airline of Mauritius.  The airline is headquartered at the "Air Mauritius Centre" in Port Louis, Mauritius.  Its main hub is Sir Seewoosagur Ramgoolam International Airport.  The company is the fourth largest carrier in Sub-Saharan Africa, and has an important standing in the European, African, and Indian Ocean region markets; the airline won the “2011 Indian Ocean Leading Airline Prize”, making it the seventh year in a row for it to win the award.

Air India: Air India is the flag carrier airline of India.  It is owned by Air India Limited, a government-owned enterprise, and operates a fleet of Airbus and Boeing aircraft serving 90 domestic and international destinations.  The airline has its hub at Indira Gandhi International Airport, New Delhi, alongside several focus cities across India.  Air India is the largest international carrier out of India with an 18.6% market share.  Over 60 international destinations are served by Air India across four continents.  Additionally, the carrier is the third largest domestic airline in India in terms of passengers carried (after IndiGo and Jet Airways) with a market share of 13.5% as of July 2017.  The airline became the 27th member of Star Alliance on 11 July 2014.

Nepal Airlines: Nepal Airlines Corporation (Nepali: नेपाल वायुसेवा निगम ) is the flag carrier airline of Nepal.  Its head office is in the Nepal Airlines Corporation (NAC) Building in Kathmandu, and its main base is Tribhuvan International Airport, Kathmandu.  The airline was established in July 1958 as Royal Nepal Airlines Corporation (RNAC) to be Nepal's first airline.  The airline's first aircraft was a Douglas DC-3, used to serve domestic routes and a handful of destinations in India.  The airline acquired its first jet aircraft, Boeing 727s, in 1972.  As of May 2017, the airline operates a fleet of ten aircraft.

Supporting paragraphs: Social seating KLM
Answer: Amsterdam Airport Schiphol