Question: What is the national flag carrier of Pakistan, who's Managing Director resigned over strikes by employees against the airline's management structure and decision-making board

Context paragraphs:
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.

Pakistan International Airlines: Pakistan International Airlines (Urdu: ‎ ) commonly known as PIA (Urdu: ‎ ) is the national flag carrier of Pakistan.  Its main hub is Karachi while Lahore and Islamabad are its secondary hubs.

William J. Mulrow: Bill Mulrow (born January 26, 1956) is an American businessman, investment banker and government official.  He is a Senior Managing Director at the Blackstone Group, an alternative asset manager.  Previously, he was a Director of Global Capital Markets at Citigroup, Inc., a Managing Director of Paladin Capital Group, a Senior Vice President and Head of New Product Development at Gabelli Asset Management (now GAMCO Investors), a Managing Director in Corporate Finance for Rothschild Inc., and a Managing Director and Head of Public Finance Banking for Donaldson, Lufkin and Jenrette Securities Corporation.

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.

China Airlines: China Airlines (CAL) () () is the flag carrier and largest airline of the Republic of China (Taiwan).  It is headquartered in Taoyuan International Airport and has 12,607 regular employees.  China Airlines operates over 1,400 flights weekly to 118 airports in 115 cities (including codeshare) across Asia, Europe, North America and Oceania.  The cargo division operates 91 pure freighter flights weekly.  The carrier was, in 2013, the 29th and 10th largest airline in the world in terms of passenger revenue per kilometer (RPK) and freight RPK, respectively.  China Airlines has three airline subsidiaries: Mandarin Airlines operates flights to domestic and low-demand regional destinations; China Airlines Cargo, a member of Skyteam Cargo, operates a fleet of freighter aircraft and manages its parent airline's cargo-hold capacity; Tigerair Taiwan is a low-cost carrier established by China Airlines and Singaporean airline group Tigerair Holdings and is wholly owned by China Airlines Group.

List of airlines of Pakistan: The Pakistan aviation industry started with Orient Airways, founded on 23 October 1946.  Orient Airways commenced operations with four Douglas DC-3s on 4 June 1947 and ceased its operations on 11 March 1955 by merging into the Pakistan International Airlines Corporation (PIAC; founded in 1954) to become the national flag carrier of Pakistan called Pakistan International Airlines (PIA).

Jat Airways: Jat Airways (Serbian: Јат ервеј "Jat ervej", stylized as JatAirways; ] ) was the national flag carrier and largest airline of Serbia, and formerly Yugoslavia.  Founded in 1927 as Aeroput, the airline ceased operations during World War II.  After resuming flights in 1947, the airline was renamed "JAT Jugoslovenski Aerotransport" on 1 April 1947.  The airline was renamed again on 8 August 2003.  Jat Airways and their predecessors were one of the oldest airlines still in operation.  Flight operations were based at Belgrade Nikola Tesla Airport, and the airline operated scheduled services to 72 international destinations, outside the areas formerly part of Yugoslavia, as well as charters and wet leases. Jat Airways was owned by the government of Serbia and had 1,250 employees.

Flag code of India: The Flag Code of India is a set of laws, practices and conventions that apply to the display of the national flag.Flag Code of India, 2002, has been divided into three parts.  Part I of the code contains a general description of the national flag.  Part II of the code is devoted to the display of the national flag by members of public, private organizations, educational institutions, etc.  Part III of the code relates to display of the national flag by Central and state governments and their organizations and agencies.

Day of the National Flag (Ukraine): 23 August is celebrated as the Day of the National Flag (Ukrainian: День Державного Прапора України "Day of the National Flag of Ukraine") in Ukraine; beginning with 2004.  July 24 was previously marked as National Flag Day in Kiev.  The first ceremonial raising of the yellow-and-blue Ukrainian flag in modern times took place on 24 July 1990 at the flagstaff of the Kiev City Council, two years before the flag was officially adopted as the National flag of the Ukrainian state (1992).

Aijaz Haroon: Aijaz Haroon is an Airline Captain who was the Managing Director of Pakistan International Airlines, until his resignation in February 2011 over strikes by employees against the airline's management structure and decision-making board.

Supporting paragraphs: Aijaz Haroon Pakistan International Airlines
Answer: Pakistan International Airlines