Question: Before merging with First Choice Airways, what had Thomasfly been know as?

Context paragraphs:
First Choice Airways destinations: First Choice Airways served the following destinations before merging with Thomsonfly (Thomson Airways destinations for the merged destinations):

William McCann (footballer): William McCann was a Scottish footballer who played as a goalkeeper.  McCann was the first choice goalkeeper for Liverpool F.C. during the first half of the 1894–95 season.  After conceding 11 goals in 3 games he was replaced as the keeper by Matt McQueen, he was restored to first choice keeper in a 4–0 win over West Bromwich Albion F.C..  He made his last appearance for the club in February 1895 and left the club soon afterwards.

First Choice Emergency Room: First Choice Emergency Room is a Flower Mound, Texas-based company that operates freestanding emergency rooms in Texas and Colorado.  It is the largest and oldest such provider in the US.  First Choice was founded by Jack Novak in 2002.

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.

First Choice Haircutters: First Choice Haircutters is a hairdressing company.  The company originated with a single salon in London, Ontario, in 1980 and began franchising about 2 years later.  First Choice Haircutters was purchased by Regis Corporation in October 2000.  Currently it has over 400 locations throughout Canada and the United States.  It is a franchise company, and experienced system-wide sales of nearly $3 billion in 2007.  First Choice Haircutters is a subsidiary of Regis Corporation; the largest hair salon chain in the world which also owns other concepts such as Supercuts, Vidal Sassoon, Cost Cutters and SmartStyle.

First Choice Airways: First Choice Airways was a British charter airline of European tour operator TUI Travel PLC, based in Crawley, England until its merger with Thomsonfly to form Thomson Airways in 2008.  It flew to more than 60 destinations worldwide from 14 UK and Irish airports.  70% of the airline's services were operated for its parent company, rising to 85% in the summer season, with the remainder on behalf of some 120 other tour operators.  It also operated scheduled year-round leisure routes to Cyprus and the resorts of Spain and Portugal.

Air 2000: Air 2000 was a British charter airline that operated for 17 years between 1987 and 2004.  The airline was renamed as First Choice Airways in 2004 which lasted until TUI Travel PLC merged with First Choice Holidays PLC in 2008 and as a result First Choice Airways was merged with Thomsonfly to create Thomson Airways.

Iven Austbø: Iven Austbø (born 22 February 1985) is a Norwegian professional football goalkeeper who currently plays for Norwegian team Viking.  He began his senior career in Viking, where he got his debut on the top level in Norway in 2004.  Austbø became Viking's first choice goalkeeper after Anthony Basso left the club in 2006, and remained the first choice for the rest of the season.  When Viking brought Thomas Myhre home from Charlton in 2007, Austbø was put back on the bench.  Wanting to play first team football, Austbø signed for Stabæk in 2008, but again found himself to be the second choice behind Jon Knudsen.  He was sold to Sandefjord in 2011, where he was the club's first choice goalkeeper in Adeccoligaen (the second highest level on the Norwegian football pyramid) for three seasons.  After the 2013 season, he signed for Viking again.

Choice Airways: Choice Airways is an American charter airline based in Fort Lauderdale, Florida.

Bob Taylor (cricketer): Robert William Taylor (born 17 July 1941), known as Bob Taylor, is a former English cricketer who played as wicket-keeper for Derbyshire between 1961 and 1984 and for England between 1971 and 1984.  He made 57 Test, and 639 first class cricket appearances in total, taking 1,473 catches.  The 2,069 victims across his entire career is the most of any wicket-keeper in history.  He is considered as one of the world's most accomplished wicket-keepers.  He made his first class debut for Minor Counties against South Africa in 1960, having made his Staffordshire debut in 1958.  He became Derbyshire's first choice wicket-keeper when George Dawkes sustained a career-ending injury.  His final First Class appearance was at the Scarborough Festival in 1988.  He remained first choice until his retirement except for a short period in 1964 when Laurie Johnson was tried as a batsman-wicketkeeper.

Supporting paragraphs: First Choice Airways destinations Thomsonfly
Answer: Britannia Airways