Hong Kong Dragon Airlines Ltd (Chinese: 港龍航空公司), operating brand as Cathay Dragon (Chinese: 國泰港龍航空) and previously as Dragonair, is a Hong Kong-based international regional airline, with its corporate headquarters, Cathay Dragon House, and main hub at Hong Kong International Airport.
 As of 30 October 2013, the airline operates a scheduled passenger network to 44 destinations in 13 countries and territories across Asia.
 Additionally, the airline has 3 codeshares on routes which are served by partner airlines.
 It has an all Airbus fleet of 41 aircraft, consisting of A320s, A321s and A330s. Cathay Dragon is a wholly owned subsidiary of Hong Kong's flag carrier, Cathay Pacific, and is an affiliate member of the Oneworld airline alliance.
 The airline was founded on May 24, 1985 by Chao Kuang Piu, the airline's present honorary chairman.
 Its maiden flight departed Hong Kong for Kota Kinabalu, Malaysia after being granted an air operator's certificate (AOC) by the Hong Kong Government in July 1985.
 In 2010, Dragonair, together with its parent, Cathay Pacific, operated over 138,000 flights, carried nearly 27 million passengers and over 1.80 billion kg of cargo and mail.
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.
Trade Air d.o.o. is a Croatian passenger and cargo charter airline headquartered in Zagreb and based at Zagreb Airport.
 The company is registered as an airline whose main activities are passenger charter flights and cargo operations, organized either on charter chain flights or "ad hoc" flights.
 Trade Air also specialises in the transportation of dangerous goods.
Xpress Air established itself as a Domestic Regular Airline that offers direct flights to the Eastern parts of Indonesia, with its first leap in the year 2005 and from 2014 served international routes to Malaysia.
 Beginning with its two Boeing 737s, Xpress Air became the first privately owned, scheduled airline that connects Jakarta to 24 domestic destinations like Makassar (formerly known as Ujung Pandang), Ternate, Sorong, Manokwari, and Jayapura.
 Makassar serves as a main hub for all flights coming from Java islands to the Eastern cities of Indonesia, while Sorong serves as a second hub in Papua, connecting remote places surrounding West Papua Area.
America West Airlines was a U.S. airline headquartered in Tempe, Arizona.
 Their main hub was at Sky Harbor Airport in Phoenix, Arizona, with a secondary hub at Las Vegas McCarran International Airport in Las Vegas, Nevada.
 The airline became part of the US Airways Group after it acquired the larger airline in 2005 and adopted the US Airways brand name.
 America West was the second largest low-cost carrier in the U.S. after Southwest Airlines and served approximately 100 destinations in the US, Canada, and Mexico.
 Service to Europe was provided through codeshare partners.
 In March 2005, the airline operated a fleet of 132 aircraft, with a single maintenance base at Sky Harbor Airport in Phoenix.
 Regional jet and/or turboprop feeder flights were operated on a code sharing basis by Mesa Airlines and Chautauqua Airlines as America West Express.
Jacksons International Airport (IATA: POM, ICAO: AYPY) , also known as Port Moresby Airport, is located 8 kilometres (5 miles) outside Port Moresby, in Papua New Guinea.
 It is the largest and busiest airport in Papua New Guinea and is the main hub for Air Niugini, the national airline of Papua New Guinea, as well as the main hub for PNG Air and Travel Air.
 It replaced the original Port Moresby airport, in what is now the suburb of Waigani, whose airstrip remained until the 1990s but no trace of which is now there, it having been built over.
Meridian Airways was a Ghanaian registered cargo airline (with an Air Operator Certificate Number of AOC 023) with its head office in Kotoka International Airport, Accra, and served as its main hub at Ostend-Brugge International Airport in Belgium.
 The company started operations as Air Charter Express in 2007 with a Douglas DC-8-63/AF.
 Operating two DC-8s on cargo charter flights from Ostend Airport to the Middle East.
 The airline also operated charter flights for the British Ministry of Defence from RAF Lyneham.
Sindhi biryani (Sindhi: سنڌي برياني‎ ) is a special meat and rice biryani dish originating from the Sindh province of Pakistan.
 Owing to its popularity, it forms one of the most consumed dishes of Pakistani cuisine and Sindhi cuisine.
 Sindhi biryani is served in nearly all the flights of Pakistan International Airlines (PIA).
British Airways (BA) is the flag carrier airline of the United Kingdom.
 It is the largest airline in the UK based on fleet size, international flights and international destinations.
 British Airways was considered the largest UK airline by passenger numbers from its creation in 1974 until 2008, when it was displaced by low-cost rival EasyJet.
 Since its inception, British Airways has been centred at its main hub at London Heathrow Airport, with a second major hub at London Gatwick Airport.
Hawaiian Airlines (Hawaiian: "" ) is the largest airline in Hawaii.
 It is the 8th largest commercial airline in the US, and is based in Honolulu, Hawaii.
 The airline operates its main hub at Honolulu International Airport and a secondary hub out of Kahului Airport on the island of Maui.
 Hawaiian Airlines operates flights to Asia, Hawaii, New Zealand, Australia and the United States Mainland.
 Hawaiian Airlines is owned by Hawaiian Holdings, Inc. of which Mark Dunkerley is the current President and Chief Executive Officer.

Question: Sindhi biryani is served in nearly all the flights of an airline whose main hub is what?
Answer: Karachi