Question: What is the hub of the airline that was a main sponsor of the 2007 Lexus Cup?

Context paragraphs:
IJsboerke (cycling team): IJsboerke was a Belgian professional cycling team that existed from 1973 to 1982.  Its main sponsor from 1973 to 1980 was Belgian ice cream manufacturer .  In 1981 and 1982, its main sponsor was juice drink brand Capri Sun (French: Capri Sonne).  Walter Godefroot won the 1978 Tour of Flanders with the team.

Singapore Airlines: Singapore Airlines Limited (SIA; ) is the flag carrier of Singapore with its hub at Singapore Changi Airport.  The airline uses the Singapore Girl as its central figure in its corporate branding.

2006 Lexus Cup: The 2006 Lexus Cup was a golf event competed by women representing Asia and an International squad representing the rest of the world.  Each team was made up of twelve members.  The competition took place at the Tanah Merah Country Club in Singapore from 15–17 December 2006.  Lexus was the title sponsor while Rolex, DBS, Singapore Airlines and Singapore Sports Council were main sponsors.  The Asian team took a dramatic 12½ to 11½ victory in the second annual event, tying the all-time series 1-1.

The Championship by Lexus: The Championship by Lexus was an annual event on the Japan Golf Tour.  It was played from 2008 to 2010.  It was played at the Otone Country Club in Bandō, Ibaraki.  The 2010 purse was ¥150,000,000 with ¥30,000,000 going to the winner.  The main sponsor is Lexus.

2007 Lexus Cup: The 2007 Lexus Cup was a golf event competed by women representing Asia and an International squad representing the rest of the world.  Each team was made up of twelve members.  The competition took place at The Vines Resort & Country Club in Perth, Australia from 7–9 December 2007.  Lexus was the title sponsor; Rolex, DBS, Singapore Airlines and Singapore Sports Council were main sponsors.

2008 Lexus Cup: The 2008 Lexus Cup was a professional women's golf event contested by two teams of 12 members each: one representing Asian countries and the other representing the rest of the world, known as the "International" team.  Since the event's inception in 2005, it has been sanctioned by the world's dominant women's professional golf tour, the LPGA Tour in the U.S., although it is an unofficial event in which no earnings by the competitors affect their positions on the LPGA money list.

Warped Tour: The Warped Tour is a traveling rock festival that has toured the United States (including 3 or 4 stops in Canada) annually each summer since 1995.  It is the largest traveling music festival in the United States, and is the longest-running touring music festival in North America.  The first Warped Tour took place in 1995, and the skateboard shoe manufacturer Vans became the main sponsor of the tour starting with the second tour in 1996, when it became known as the Vans Warped Tour.  Although Vans has continued to be the main sponsor and lend its name to the festival, other sponsors have also participated, with stages or other aspects of the festival sometimes being named after them.

2005 Lexus Cup: The 2005 Lexus Cup was the inaugural edition of the annual golf match competed by women representing Asia and an international squad.  Each team was made up of twelve members.  The competition took place at the Tanah Merah Country Club in Singapore from 9–11 December 2005.  Lexus was he title sponsor while Rolex, DBS, Singapore Airlines, and Singapore Sports Council are main sponsors.  The total purse was US$960,000, with $50,000 going to each member of the winning team and $30,000 to members of the other team.

Future Cup: The Future Cup (officially known as the ABN AMRO Future Cup, and previously known as the AEGON Future Cup) is an annual friendly international youth tournament which is organized by the Dutch football club AFC Ajax.  The tournament is created for under-17 youth teams, and is held at De Toekomst, every year during the Easter weekend.  The tournament has been contested by some of the strongest under-17 teams in football, with FC Barcelona, Manchester United and |Bayern München amongst the participating clubs.  The first five editions of the tournament were named after its main sponsor, the insurance company AEGON, before the Dutch state-owned bank ABN AMRO took over as the main sponsor of the event.  The tournament is broadcast on television in over 59 countries via Eredivisie Live, Eurosport and Fox Sports.

Lexus Cup: The Lexus Cup was an annual golf tournament played between 2005 and 2008 for professional women golfers contested by a team representing Asia and an international team representing the rest of the world.  It was sanctioned by the LPGA Tour, but any winnings were unofficial and were not included in the LPGA money list standings.

Supporting paragraphs: 2007 Lexus Cup Singapore Airlines
Answer: Singapore Changi Airport