Question: Where is White Airways headquartered?
Context: Rio Airways was a regional passenger airline headquartered in Killeen, Texas, United States, which was operational from 1967 to 1987.  Rio Airways briefly operated code sharing flights on behalf of Delta Air Lines whereby Rio flights were booked and sold under the Delta Connection brand name.  Prior to the Delta Connection service, Rio Airways (Code "XO") operated independently but shared terminal gates at the DFW airport first with Texas International Airlines (1974), then with Braniff (1975-1978).  Prior to operations at DFW it operated at Dallas Love Field, having its roots in two smaller commuter air carriers, Dal Airways and Hood Airways. TAP Express (Transportes Aéreos Portugueses or TAP for short) is a Portuguese regional airline brand name for TAP Portugal which operate short- and medium-haul routes.  TAP Portugal's lone wholly owned regional airline, Portugália Airlines, operates under the TAP Express banner.  White Airways, an airline owned by Omni Aviation, also operates regular flights for TAP Express using 9 ATR 72 turboprops.  Its head office is on the grounds of Lisbon Portela Airport in Lisbon. Dynamic Airways LLC, doing business as Dynamic International Airways, is a U.S. Certificated airline owned by private owners, founded in 2010.  The airline operates Boeing 767-200ERs and Boeing 767-300ERs; and formerly operated McDonnell Douglas MD-88s. Formerly known as Dynamic Airways, the company added International to its official name to reflect its transition from a charter airline into scheduled international services.  Dynamic is headquartered in Greensboro, North Carolina and offers service from New York to South America.  Dynamic also previously operated from Fort Lauderdale, Chicago, Los Angeles and New York to the Caribbean, Cancun, and South America. 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. White Airways is a Portuguese charter airline headquartered in Porto Salvo, Oeiras.  It mainly operates charter flights from Lisbon Humberto Delgado Airport on behalf of tour operators as well as on lease on behalf of other airlines. 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. Tiger Airways Singapore Pte Ltd, operating as Tigerair, was a budget airline headquartered in Singapore.  It operated services to regional destinations in Southeast Asia, Bangladesh, China and India from its main base at Singapore Changi Airport.  It was founded as an independent airline in 2003, and was listed on the Singapore Stock Exchange under the Tiger Airways Holdings name in 2010.  In October 2014, parent company Tiger Airways Holdings became a subsidiary of the SIA Group, who took a 56% ownership stake. American Airlines Group, Inc. is an American publicly traded airline holding company headquartered in Fort Worth, Texas.  It was formed December 9, 2013, in the merger of AMR Corporation, the parent company of American Airlines, and US Airways Group, the parent company of US Airways.  The airline groups together form the largest airline in the world, with more than 6,700 daily flights to 336 locations in 56 countries worldwide, about $40 billion in operating revenue, over 100,000 employees, and plans to take delivery of 607 new aircraft, including 517 narrowbody aircraft and 90 widebody international aircraft.  The integration of American Airlines and US Airways was completed when the Federal Aviation Administration granted a single operating certificate for both carriers on April 8, 2015. West African Airways Corporation, or WAAC for short, was an airline that operated from 1946 to 1958, jointly owned by the governments of Britain's four west African colonies, namely The Gambia, the Gold Coast (now Ghana), Nigeria, and Sierra Leone.  The carrier was headquartered at the "Airways House" in Ikeja, Nigeria, and operated from its hub in Lagos Airport.  It was dissolved on none }} , after all the shareholder countries but Nigeria set up their own national airlines following their independence.  As the sole remaining major stockholder of the airline, the government of Nigeria continued to operate it as WAAC Nigeria, which was eventually renamed Nigeria Airways and became the flag carrier of the country. White Airways serve the following destinations (as of December 2012):
Answer: Porto Salvo, Oeiras