Question: From where is the graffiti artist that did advertising work for the aviation company by Thomas Flohr?

Context paragraphs:
Dunc “Turbo” Dindas: Dunc Dindas, who goes by the nickname "Turbo", is a Turkish graffiti artist who does most of his work in Istanbul, Turkey.  His work has appeared in corporate offices, commercials, and in multiple neighborhoods of Istanbul.  The style he champions is unique for Turkish art in the sense that it combines New York style subway art with bubble lettering.  Many know him as the most popular graffiti artist in Istanbul.

Reverse graffiti: Reverse graffiti, also known as clean tagging, dust tagging, grime writing, clean graffiti, green graffiti or clean advertising, is a method of creating temporary or semi-permanent images on walls or other surfaces by removing dirt from a surface.  It can also be done by removing dirt/dust with the fingertip from windows or other dirty surfaces, such as writing "wash me" on a dirty vehicle.  Others, such as graffiti artist Moose, use a cloth or a high-power washer to remove dirt on a larger scale.

Temper (artist): Temper is an English graffiti artist.  He is most prolific in the advancement of spray paint photorealism in the United Kingdom.  He was the first graffiti artist to create a conceptual collection on canvas and revolutionalised portraiture in popular culture globally with his "The Good Die Young" concept and collection in 2002.  His groundbreaking 2001 exhibition "Minuteman" was the first by a solo graffiti artist in a public art gallery held at Birmingham Museum and Art Gallery in the United Kingdom and broke attendance records for ethnic minority audience.  In 2001 he had his own signature can design on millions of Sprite cans throughout the UK and parts of Europe.  During his twenty-two year professional career he has a record of 16 consecutive sellout collections.

VistaJet: VistaJet is a global business aviation company founded in 2004 by Thomas Flohr.  The firm flies government, corporate and private clients between any two points, under a "pay for hours flown" fare structure.

Danilo Maldonado Machado: Danilo Maldonado Machado, known as El Sexto ("The Sixth"), born April 1, 1983, is a Cuban graffiti artist and human rights activist who has been arrested and imprisoned several times.  His graffiti are a form of protest, criticizing the abuse of the Cuban people at the hands of the Castro regime, and he is “frequently detained by the police under any pretext.”  He has been called “a graffiti artist who does not forgive the Cuban regime.”  A report in April 2015 stated that he was, at that time, “the most persecuted of Cuban artists.”

Retna: RETNA (born Marquis Lewis 1979) is a contemporary artist, primarily recognized for graffiti art.  He was born and raised in Los Angeles, and started his career in the early 1990s.  He developed a distinctive constructed script which is derived from Blackletter, Egyptian Hieroglyphics, Arabic, and Hebrew calligraphy, as well as more traditional types of street-based graffiti.  In addition to exhibiting at institutions and galleries in Los Angeles, Miami, London, New York and Hong Kong, Retna has done advertising work for brands such as VistaJet, Louis Vuitton, and Nike.  His artwork adorns the cover of Justin Bieber's Purpose album that debuted in 2015.

Dr. Love (artist): Dr. Love (born in 1985 as Bacha Khoperia) is a Georgian street/graffiti artist based in Tbilisi, Georgia.  Dr. Love mostly creates multi-layer, full color graffiti, textual murals and street installations, basing his motives on pop-cultural references of humor or critical context.  Most of his graffiti paintings are in Tbilisi and so far he is the author of the biggest graffiti in Georgia, that is located in Batumi.  Dr. Love participated in "Upfest", Europe's largest street art festival in the United Kingdom where his graffiti painting now occupies one of Bristol's walls.  He was also present at the "Global street art show" held in Germany.  His first ever graffiti was dedicated to Irakli Charkviani.  Besides being graffiti artist he is a programmer and musician.

Cornbread (graffiti artist): Darryl McCray, known by his tagging name, "Cornbread", is a graffiti artist from Philadelphia, credited with being the first modern graffiti artist.  McCray was born in North Philadelphia in 1953 and raised in Brewerytown, Philadelphia, a neighborhood of North Philadelphia.  During the late 1960s, he and a group of friends started "tagging" Philadelphia, by writing their nicknames on walls across the city.  The movement spread to New York City and blossomed into the modern graffiti movement, which reached its peak in the U.S. in the late 1970s and early 1980s, and then spread to Europe.  Since his tagging days, McCray has developed a close relationship with The Philadelphia Mural Arts Program.  He is a public speaker and a youth advocate.

Banksy: Banksy is an anonymous England-based graffiti artist, political activist and film director of unverified identity.  Their satirical street art and subversive epigrams combine dark humour with graffiti executed in a distinctive stenciling technique.  Banksy's works of political and social commentary have been featured on streets, walls, and bridges of cities throughout the world.  Banksy's work grew out of the Bristol underground scene, which involved collaborations between artists and musicians.  Banksy says that they were inspired by 3D, a graffiti artist who later became a founding member of the English musical group Massive Attack.

Videograf Productions: Videograf Productions is an underground video magazine series that documents the U.S. graffiti subculture.  Videograf was founded in 1989 by two former New York city graffiti writers Carl Weston and Colin "KoolSpin" Turner.  The inspiration for the Videograf series came during the summer of 1988, from the graffiti zine movement.  It was publications like New York City's "International Graffiti Times" published by David Schmidlapp and Phase2 and the first color graffiti zine from Los Angeles - "Can Control Magazine" published by Power that planted the idea of doing a videotape version of a fan zine.  By February 1989 Videograf issue one was in full production.  By the summer of 1989, photographer and graffiti artist William "Nic One" Green joined the Videograf team as a producer.  A year later the future cofounder of Egotrip magazine, writer and television producer Sacha Jenkins joined Videograf as well.  The Videograf Productions operation was run out of Henry Chalfant's studio at 64 Grand Street for about 3 years before moving to Greenpoint Brooklyn.

Supporting paragraphs: Retna VistaJet
Answer: Los Angeles