Question: Trans States Holdings owns the airline that has headquarters in what city?

Context articles: GoJet Airlines
Enagás
Metalloinvest
Trans States Holdings
Raleigh–Durham International Airport
US Airways Express destinations
Trans States Airlines
PREDITOR
Koei Tecmo
AOC Holdings

GoJet Airlines LLC is a company headquartered in Bridgeton, Missouri, United States.
 Wholly owned by Trans States Holdings, it has 1670 employees.
 It operates commuter feeder services under the United Express and Delta Connection names.
 Go Jet Airlines has crew bases at Lambert-Saint Louis International Airport, O'Hare International Airport, Denver International Airport, and Raleigh-Durham International Airport.
 Flights are currently operated out of United's hubs at O'Hare International Airport and Denver International Airport, as well as Lambert-Saint Louis International Airport.
 GoJet's Delta Connection flights currently operate out of Lambert-Saint Louis International Airport , Detroit Metropolitan Airport and Raleigh-Durham International Airport.
 Its call sign "Lindbergh" is named after aviation pioneer Charles Lindbergh, who flew the "Spirit of St. Louis" solo across the Atlantic Ocean in 1927, the first person to do so.
Enagás, S.A. (] , originally an initialism for Empresa Nacional del Gas) is a Spanish energy company and European TSO, which owns and operates the nation's gas grid.
 The firm also owns four liquefied natural gas regasification terminals in the country, at Huelva, Barcelona, Cartagena and Gijon.
 In addition, it owns 50% of the plant BBG (Bilbao) and 100% of Gascan.
 The chairman of Enagás is Antonio Llardén Carratalá and his Chief Executive Officer is Marcelino Oreja Arburúa.
 The firm's headquarters are located in Madrid.
 Apart from Spain, Enagás has presence in Mexico, Perú, Chile, Sweden and in the Trans Adriatic Pipeline (TAP) European project.
Metalloinvest Management Company LLC (Russian: Металлоинвест ) is a Russian mining and metallurgy company specializing in the manufacture of steel.
 It was founded in 1999 and is composed of a mining division (Lebedinsky GOK and Mikhailovsky GOK) and a steel division (Oskol Elektrometallurgical Plant (OEMK) and Ural Steel).
 USM Holdings owns 100% of Metalloinvest JSC.
 Alisher Usmanov is the major beneficiary of USM Holdings (48%), with other major beneficiaries — the companies of Vladimir Skoch and Farhad Moshiri — owning 30% and 10%, respectively.
Trans States Holdings, Inc. is a privately owned holding company for three regional airlines: Compass Airlines, GoJet Airlines and Trans States Airlines.
 The holding company is headquartered in Bridgeton, Missouri near the Lambert-St.
 Louis International Airport.
Raleigh–Durham International Airport (IATA: RDU, ICAO: KRDU, FAA LID: RDU) is the main airport serving Raleigh, Durham, and the surrounding Research Triangle region of North Carolina.
 It is located 4+1/2 mi northeast of the town of Morrisville in Wake County.
 The airport covers 5,000 acres (2,000 ha) and has three runways and has passenger service to 41 destinations with 126 average daily departures, including nonstop intercontinental service to London and Paris.
 In 2016, RDU set an all-time record for passengers, with 11,049,143 passengers traveling through the airport.
 The RDU Airport Authority is in charge of the airport facilities and its operations and is controlled by a board of representatives from the counties of Wake and Durham and the cities of Raleigh and Durham.
 The airport is a focus city for Delta Air Lines and is also a crew base for regional carriers Trans States Airlines and GoJet Airlines.
Below is a list of destinations served by the carriers under the banner of US Airways Express: Air Wisconsin, Mesa Airlines, Piedmont Airlines, PSA Airlines, Republic Airlines, and Trans States Airlines.
Trans States Airlines, along with Compass Airlines and GoJet Airlines, is owned by Trans States Holdings and is headquartered in Bridgeton, Missouri.
PREDITOR (PREDIction of TORsion angles) is a freely available web-server for the prediction of protein torsion angles from chemical shifts. For many years it has been known that protein chemical shifts are sensitive to protein secondary structure, which in turn, is sensitive to backbone torsion angles. torsion angles are internal coordinates that can be used to describe the conformation of a polypeptide chain.
 They can also be used as constraints to help determine or refine protein structures via NMR spectroscopy.
 In proteins there are four major torsion angles of interest: phi, psi, omega and chi-1.
 Traditionally protein NMR spectroscopists have used vicinal J-coupling information and the Karplus relation to determine approximate backbone torsion angle constraints for phi and chi-1 angles.
 However, several studies in the early 1990s pointed out the strong relationship between 1H and 13C chemical shifts and torsion angles, especially with backbone phi and psi angles.
 Later a number of other papers pointed out additional chemical shift relationships with chi-1 and even omega angles.
 PREDITOR was designed to exploit these experimental observations and to help NMR spectroscopists easily predict protein torsion angles from chemical shift assignments.
 Specifically, PREDITOR accepts protein sequence and/or chemical shift data as input and generates torsion angle predictions for phi, psi, omega and chi-1 angles.
 The algorithm that PREDITOR uses combines sequence alignment, chemical shift alignment and a number of related chemical shift analysis techniques to predict torsion angles. PREDITOR is unusually fast (<40 s per protein) and exhibits a very high level of accuracy.
 In a series of tests 88% of PREDITOR’s phi/psi predictions were within 30 degrees of the correct values, 84% of chi-1 predictions (3-state predictions) were correct and 99.97% of PREDITOR’s predicted omega angles were correct.
 PREDITOR also estimates the torsion angle errors so that its torsion angle constraints can be used with standard protein structure refinement software, such as CYANA, CNS, XPLOR and AMBER.
 PREDITOR also supports automated protein chemical shift re-referencing and the prediction of proline cis/trans states.
 PREDITOR is not the only torsion angle prediction software available.
 Several other computer programs including TALOS, TALOS+ and DANGLE have also been developed to predict backbone torsion angles from protein chemical shifts.
 These stand-alone programs exhibit similar prediction performance to PREDITOR but are substantially slower.
Koei Tecmo Holdings Co., Ltd. (株式会社コーエーテクモホールディングス , Kabushikigaisha Kōē Tekumo Hōrudingusu ) , is a Japanese video game holding company created in 2009 by the merger of Koei and Tecmo.
 It was founded as Tecmo Koei Holdings.
 Koei Tecmo Holdings owns several companies, the biggest one of those being its flagship game developer and publisher Koei Tecmo Games that was founded in 1978 as Koei.
AOC Holdings (AOCホールディングス株式会社 , Eiōshī Hōrudingusu Kabushiki-gaisha ) () is a large Japanese oil and natural gas company based in Tokyo, Japan and specialised in exploring, developing, producing, selling, buying and refining oil and natural gas.
 AOC Holdings owns several large companies like the "Arabian Oil Company", "Norske AEDC" and "AOC Egypt Petroleum Company" that operate and manage oil and gas fields in different parts of the world and the "Fuji Oil Company" that owns the Sodegaura Refinery with a capacity of 192000 oilbbl/d .