Question: Who operates the airport that Regent Airways is based at?

Context paragraphs:
IBC Airways: IBC Airways is an FAR Part 135 on-demand airline headquartered in unincorporated Broward County, Florida, near Fort Lauderdale.  IBC Airways operates on-demand cargo services to the Caribbean.  Its main bases are Miami International Airport (MIA) and Fort Lauderdale-Hollywood International Airport (FLL).  In 2005, IBC Airways began offering on-demand passenger services.

Habib Group: The Habib Group is a prominent Bangladeshi industrial conglomerate.  Founded in Chittagong in 1947, it employs over 20,000 people and has various interests in textiles, aviation, cement, steel, real estate, insurance and banking.  It is the parent company of Regent Airways, a Bangladeshi private airline, and Regent Power Limited, a power generating company.

Iraqi Airways: Iraqi Airways Company, operating as Iraqi Airways (Arabic: الخطوط الجوية العراقية‎ ‎ "Al-Khuṭūṭ al-Jawwiyyah al-`Irāqiyyah"), is the national carrier of Iraq, headquartered on the grounds of Baghdad International Airport in Baghdad.  It is the oldest airline in the Middle East.  Iraqi Airways operates domestic and regional service.  Its main base is Baghdad International Airport.

US Airways Group: US Airways Group Inc. was an airline holding company based in Tempe, Arizona.  US Airways Group operated US Airways, along with its subsidiaries PSA Airlines, Inc. and Piedmont Airlines, Inc., which are wholly owned but marketed under the branding of US Airways Express.  It merged with America West Holdings Corporation, parent of America West Airlines, in 2005, and the combined company adopted the better-known US Airways name; the two airlines' operating certificates merged in 2007.  It also operates additional companies that provide associated services.  ACE Aviation Holdings, the Canadian parent of Air Canada retained a roughly 6.1% investment stake in US Airways Group.  The route network covered destinations in 47 states, as well as international destinations.

Maputo International Airport: Maputo International Airport (IATA: MPM, ICAO: FQMA) , also known as Lourenço Marques Airport or Mavalane International Airport, is an airport located 3 km northwest of the center of Maputo, the largest city and capital of Mozambique.  It is the largest airport in Mozambique, and hub for LAM Mozambique Airlines and Kaya Airlines.  Most destinations served from the airport are in Africa but TAP Portugal operates a service to Lisbon, Portugal, Turkish Airlines operates flights to Istanbul, and Qatar Airways operates flights to Doha.

New Gen Airways: New Gen Airways（Chinese mean is 泰国新时代航空）, a trading name for Sabaidee Airways Company Limited, (Thai: บริษัท สบายดีแอร์เวย์ส จำกัด), is a Thai international airline that concentrates on flights from Thailand to China.  It operates both scheduled- and non-scheduled (charter) services from 5 main Thailand hubs, Bangkok's Don Mueang International Airport , U-Tapao International Airport, Krabi International Airport , Phuket International Airport and Surat Thani International Airport in the southern cities of Krabi, Phuket and Surat Thani, to a total of 30 destinations in China.

Shahjalal International Airport: Hazrat Shahjalal International Airport (Bengali: হযরত শাহ্‌জালাল আন্তর্জাতিক বিমানবন্দর "Hôzrôt Shahjalal Antôrjatik Bimanbôndôr") (IATA: DAC, ICAO: VGHS (old: VGZR)) , formerly Zia International Airport, is the largest airport in Bangladesh.  Operated and maintained by the Civil Aviation Authority, Bangladesh, it is also used by the Bangladesh Air Force as a part of "BAF Bangabandhu Base".  Located in Kurmitola in northern Dhaka, it started operations in 1980, taking over as the country's capital international airport from Tejgaon Airport.  The airport is the hub of most of the private airlines in Bangladesh, including Biman Bangladesh Airlines, Regent Airways, Novoair and US-Bangla Airlines.  The airport's IATA code – "DAC" is derived from "Dacca", the previously used spelling for "Dhaka".

Molla Fazle Akbar: Molla Fazle Akbar was a three-star rank Bangladesh Army officer.  A Lieutenant General and the former Director General of Directorate General of Forces Intelligence.  Currently he is working as the Chief Executive Officer of Regent Airways, Bangladesh operating in domestic and international routes and The Chairman of Board of Directors of a Financial Institute, Bangladesh Industrial Finance Company Limited (BIFC).

Air Wisconsin: Air Wisconsin Airlines is a regional airline based at Appleton International Airport in the town of Greenville, Wisconsin, United States, near Appleton.  Air Wisconsin is the largest privately held regional airline in the United States.  It currently operates regional jet flights as American Eagle under contract to American Airlines via a code sharing agreement, serving cities in the U.S. and Canada with hubs at Boston Logan International Airport (BOS), Charlotte Douglas International Airport (CLT), Philadelphia International Airport (PHL) and Ronald Reagan Washington National Airport (DCA) .  Air Wisconsin previously operated United Express service on behalf of United Airlines followed by US Airways Express service on behalf of US Airways prior to becoming an American Eagle regional air carrier.  The company has announced it will once again partner with United Airlines as a United Express code sharing air carrier with primary hubs to be located at Chicago O'Hare International Airport (ORD) and Washington Dulles International Airport (IAD) beginning in September 2017 and will be "exclusively operating" as United Express by March 2018.

Regent Airways: Regent Airways (Bengali: রিজেন্ট এয়ারওয়েজ ) is a Bangladeshi airline owned by HG Aviation Ltd, a fully owned subsidiary of Habib Group.  Regent Airways is based at Hazrat Shahjalal International Airport.

Supporting paragraphs: Shahjalal International Airport Regent Airways
Answer: Civil Aviation Authority, Bangladesh