Question: Britannia Airways, the largest charter airline in the UK was rebranded by what name in 2005?

Context paragraphs:
Boston Renaissance Charter Public School: Boston Renaissance Charter Public School (BRCPS), formerly Boston Renaissance Charter School (BRCS), is a charter elementary school in the Hyde Park area of Boston.  It is one of the oldest charter schools in Boston, and as of 2012 BRCPS was also one of the largest charter schools in the city.  In 2001 it was the largest American charter school that operated out of a single campus, and in 2005 it was the largest charter school in the state of Massachusetts.  Overall it was one of the largest charter schools in the United States.  It formerly served middle school grades but now only serves elementary school.

Britannia Airways Flight 226A: Britannia Airways Flight BY226A was an international charter flight from Cardiff, Wales, UK, which crashed on landing at Girona Airport, Spain, on 14 September 1999 and broke apart.  Of the 236 passengers and 9 crew on board, two were seriously injured and 41 sustained minor injuries.  One of the passengers who had apparently sustained only minor injuries died five days later of unsuspected internal injuries.  The Boeing 757–204 aircraft, registration G-BYAG, was damaged beyond economic repair and scrapped.

Britannia Airways Flight 105: Britannia Airways Flight 105 was a scheduled passenger flight from London Luton Airport for a flight to Ljubljana Jože Pučnik Airport (known as Brnik Airport at that time).  The flight was operated by Bristol Britannia G-ANBB with 110 passengers and seven crew on board.  The aircraft crash occurred on 1 September 1966 at 00:47 during the approach, when the aircraft struck trees in the woods between Lahovče and Nasovče under cloudy conditions.  Ninety-eight of the 117 passengers and crew died in the accident.

Britannia Airways: Britannia Airways was the largest charter airline in the United Kingdom.  It was rebranded "Thomsonfly" in 2005.  Its main bases were Gatwick, London Luton, Birmingham, Manchester, Newcastle and Glasgow.  It was headquartered on the grounds of the Britannia House in Luton, Bedfordshire.

Euralair: Euralair was a charter airline based in France.  Euralair was founded in 1964 as an air-taxi and executive charter company.  In 1966 it became charter airline and operated its first charter flights in 1968 when it received the first Fokker F-27 (F-BRHL) on November 11, 1968 and the second (F-BRQL) on October 15, 1969; the last one sold to the Swiss company Belair (as HB-AAZ) in June 1973.  In order to develop its charter activity, on November 1971 Euralair bought from Austrian Airline the first Sud Aviation Caravelle VIR (F-BSEL) and in 1973 the second (F-BTDL).

JMC Air: JMC Air Services, (also known as JMC Air, JMC Airlines or simply JMC), was a UK charter airline formed by the merger of Caledonian Airways and Flying Colours Airlines, following the purchase of Thomas Cook Group by the Carlson Leisure Group.  JMC Air was named after the initials of the son of Thomas Cook, John Mason Cook.  The airline was rebranded in March 2003 to form the current Thomas Cook Airlines.  The airline served seat-only customers directly and package holiday customers via Thomas Cook Holidays and Airtours Holidays.

Thomsonfly: Thomsonfly was a British airline, which had been known as Britannia Airways.  Thomsonfly was the first stage of TUI AG's plans to expand its business within TUI UK prior to September 2007.  After TUI UK merged with First Choice Holidays in September 2007, it became part of TUI Travel PLC.  The new holiday company continued with both in-house airlines (Thomsonfly and First Choice Airways) through Winter 2007 and Summer 2008 until the two were merged on 1 November 2008 as Thomson Airways.

Canada 3000: Canada 3000 Inc. was a Canadian discount charter airline offering domestic and international flights.  It was the largest charter airline in the world at the time of its operation, with over 90 destinations worldwide, although it changed to scheduled service in 2000 after the Canadian Airlines and Air Canada merger.  Canada 3000 competed with Air Canada, WestJet, and fellow charter airline Air Transat.  In November 2001, the airline went out of business after a sharp decline in revenues following the September 11, 2001, terrorist attacks in the United States.  There have been several attempts to restart the airline since then.  The airline was headquartered in Etobicoke in the west-end of Toronto, Ontario.

Thomson Airways: Thomson Airways Limited, often referred to as Thomson, is the world's largest charter airline, offering scheduled and charter flights from the United Kingdom and the Republic of Ireland to destinations in Europe, Africa, Asia and North America.  The airline carried 10.6 million passengers in 2015, making it the third-largest UK airline by total passengers, after EasyJet and British Airways.

Caledonian Airways: Caledonian Airways was a wholly private, independent Scottish charter airline formed in April 1961.  It began with a single 104-seat Douglas DC-7C leased from Sabena.  Caledonian grew rapidly over the coming years to become the leading transatlantic "affinity group" charter operator by the end of the decade.  During that period, passenger numbers grew from just 8,000 in 1961 to 800,000 in 1970.  The latter represented 22.7% of all British non-scheduled passengers.  It also became Britain's most consistently profitable and financially most secure independent airline of its era, never failing to make a profit in all its ten years of existence.  By the end of 1970, Caledonian operated an all-jet fleet consisting of eleven aircraft and provided employment for over 1,000 workers.  At that time, its principal activities included group charters between North America, Europe and the Far East using Boeing 707s, and general charter and inclusive tour (IT) activities in Europe utilising One-Elevens.  This was also the time Caledonian merged with British United Airways (BUA), the largest contemporary independent airline and leading private sector scheduled carrier in the United Kingdom, and formed British Caledonian.

Supporting paragraphs: Britannia Airways Thomsonfly
Answer: Thomsonfly