Question: Who was the president and CEO in 1988  of an American regional airline headquartered at Dayton International Airport in Vandalia, Ohio ?

full_context: Document 1: US Airways: US Airways (formerly known as USAir) was a major American airline that ceased to operate independently when the Federal Aviation Administration granted a single operating certificate (SOC) for US Airways and American Airlines on April 8, 2015. Publicly, the two carriers appeared to merge when their reservations systems and booking processes were merged on October 17, 2015; however, other systems were still separate at that time. The airline had an extensive international and domestic network, with 193 destinations in 24 countries in North America, South America, Europe and the Middle East. The airline was a member of the Star Alliance, before becoming an affiliate member of Oneworld in March 2014. US Airways utilized a fleet of 343 mainline jet aircraft, as well as 278 regional jet and turbo-prop aircraft operated by contract and subsidiary airlines under the name US Airways Express via code sharing agreements.
Document 2: SkyWest Airlines: SkyWest Airlines is a North American airline owned by SkyWest, Inc. and headquartered in St. George, Utah, U.S.. According to the Airlines for America definitions, SkyWest is a North American major airline. SkyWest however, operates on a regional airline level and is a member of the Regional Airline Association. SkyWest Airlines flies to 238 cities, in 45 states; Washington, D.C., six Canadian provinces and five cities in Mexico. The airline serves as a feeder airline, operating under contract with various major carriers. It flies as SkyWest Airlines in a partnership with Alaska Airlines, as United Express on behalf of United Airlines, as American Eagle on behalf of American Airlines, and as Delta Connection on behalf of Delta Air Lines. SkyWest also provides ground handling services for airports across the United States.
Document 3: Charlie Johnson (pilot): Charles (Charlie) Johnson is a former president of Cessna Aircraft. He was born in 1942 in Georgia and grew up in Memphis. He has always been passionate about technology. Because he was also passionate about flight, he joined the Air Force. He fought in the Vietnam War flying the T-33, T-37, T-38, and the F-105. After the Vietnam War he continued with his love of flying. Johnson was a personal pilot for Arnold Palmer. After this he became a test pilot for Learjet. Soon after he rose through the ranks of Cessna to President and COO of Cessna Aircraft. Johnson joined Bye Aerospace in 2014 and was inducted into the Colorado Aviation Hall of Fame the same year. He has just recently been inducted into the Kansas Aviation Hall of Fame. Johnson continues to fly and has a love of cars.
Document 4: PSA Airlines: PSA Airlines, Inc. is an American regional airline headquartered at Dayton International Airport in Vandalia, Ohio, that flies under the American Eagle brand for American Airlines. PSA is a wholly owned subsidiary of American Airlines Group. PSA has crew bases in Washington, D.C.; Knoxville, Tennessee; Charlotte, North Carolina; Cincinnati, Ohio; and Dayton, Ohio. It has maintenance bases in Charlotte, North Carolina; Cincinnati, Ohio; Dayton, Ohio and at the Akron–Canton Airport in Green, Ohio.
Document 5: US Airways Express: US Airways Express was the brand name for the regional affiliate of US Airways, under which a number of individually owned commuter air carriers and regional airlines operate short and medium haul routes. This code sharing service was previously operated as USAir Express. Mainline carriers often outsource to regional airlines to operate services in order to increase frequency, serve routes that would not sustain larger aircraft, or for other competitive reasons. US Airways Express operations were conducted from smaller markets in the United States, Canada, and the Bahamas primarily centered on US Airways' major hubs and focus cities. Upon the completion of US Airways' merger process with American Airlines, US Airways Express was rebranded as American Eagle on October 17, 2015.
Document 6: Stephen Wolf: Stephen M. Wolf (born 1941) assumed his current position as chairman of R. R. Donnelley & Sons Company in March 2004. He has been the managing partner of Alpilles, LLC, since April 1, 2003. In April 2009 he became chairman of Trilantic Capital Partners, which was previously Lehman Brothers Merchant Banking. Before becoming managing partner of Alpilles, Wolf was chairman of US Airways. Wolf was chairman and chief executive officer of US Airways from January 16, 1996, until November 18, 1998, when he turned over his chief executive officer title to another executive. Wolf was responsible for the company's rebranding to US Airways from its previous identity, USAir. During Wolf's tenure, US Airways also placed an order for up to 400 Airbus A320-series narrow-body aircraft, with 120 firm orders at the time of the order signing; at the time, the order was regarded as the largest bulk aircraft request in history. Prior to joining US Airways, Wolf had served since 1994 as senior advisor to Lazard Frères. From 1987 until it was purchased by its employees in July 1994 he was chairman and chief executive officer of UAL Corporation and United Airlines, Inc.
Document 7: US Airways Group: US Airways Group Inc. was an airline holding company based in Tempe, Arizona. US Airways Group operated US Airways, along with its subsidiaries PSA Airlines, Inc. and Piedmont Airlines, Inc., which are wholly owned but marketed under the branding of US Airways Express. It merged with America West Holdings Corporation, parent of America West Airlines, in 2005, and the combined company adopted the better-known US Airways name; the two airlines' operating certificates merged in 2007. It also operates additional companies that provide associated services. ACE Aviation Holdings, the Canadian parent of Air Canada retained a roughly 6.1% investment stake in US Airways Group. The route network covered destinations in 47 states, as well as international destinations.
Document 8: American Eagle (airline brand): American Eagle is an American brand name for the regional branch of American Airlines, under which ten individual regional airlines operate short- and medium-haul feeder flights. Three of these airlines, Envoy Air (formerly American Eagle Airlines), Piedmont Airlines and PSA Airlines, are wholly owned subsidiaries of American Airlines Group. Just like the regional brands of the other two major airlines (Delta Connection and United Express), American Airlines' regional brand accounts for more than 60% of American Airlines flights.
Document 9: Hollis L. Harris: Hollis Loyd Harris (November 25, 1931 – July 13, 2016) served as President and COO of Delta Air Lines (1987-1990) and Chairman, President, and CEO of Continental Airlines (1990-1991), Air Canada (1992-1996), and World Airways (1999-2004). According to author Harry Nolan, Harris led the latter three airlines "out of the turbulence of financial instability toward profitability." In 1997 Harris and Steve Wolf signed a strategic agreement between Air Canada and United Airlines, producing what is now the Star Alliance, which grew to become the world's largest global airline alliance.
Document 10: Jonathan G. Ornstein: Jonathan Ornstein is Chairman and Chief Executive Officer of Mesa Air Group, Inc., and was appointed effective May 1, 1998. From April 1996 to his joining the company as Chief Executive Officer, Ornstein served as President and Chief Executive Officer and Chairman of Virgin Express, a European airline. From 1995 to April 1996, Ornstein served as Chief Executive Officer of Virgin Express Holdings, Inc. Ornstein joined Continental Express as President and Chief Executive Officer in July 1994 and, in November 1994, was named Senior Vice President, Airport Services at Continental Airlines. Ornstein was previously employed by the company from 1988 to 1994, as Executive Vice President and as President of the company’s WestAir Holding, Inc., subsidiary.
Document 11: Atlantic Southeast Airlines: Atlantic Southeast Airlines (ASA) was an American airline based in the A-Tech Center in College Park, Georgia, flying to 144 destinations as a Delta Connection carrier and, as of February 2010, commenced service as a United Express carrier. It was a wholly owned subsidiary of SkyWest, Inc. ASA operated nearly 900 flights each day. Its main hub was at Hartsfield-Jackson Atlanta International Airport (ATL). ASA changed its name to ExpressJet in 2011.
Document 12: Keith Houk: Keith Houk was the president and CEO of US Airways subsidiary PSA Airlines. He joined PSA as its CEO in 1988, and became president and CEO of Allegheny Airlines, another US Airways subsidiary, in 1997. He returned to lead PSA in January, 2005. Houk is a business graduate of Ohio University and a United States Air Force veteran. In 2014, he retired from PSA after 25 years of service to the company.
Document 13: Michael J. Lotz: Michael J. Lotz is President and Chief Operating Officer of Mesa Air Group, joining the Company in July 1998. In January 1999, Mr. Lotz became Chief Operating Officer. In August 1999, Mr. Lotz became the Company’s Chief Financial Officer and in January 2000 returned to the position of Chief Operating Officer. On June 22, 2000, Mr. Lotz was appointed President of the Company. Prior to joining the Company, Mr. Lotz served as Chief Operating Officer of Virgin Express, a position he held from October 1996 to June 1998. Previously, Mr. Lotz was employed by Continental Airlines, most recently as Vice President of Airport Operations, Properties and Facilities at Continental Express..
Document 14: Envoy Air: Envoy Air Inc. (formerly American Eagle Airlines) is an air carrier headquartered in Irving, Texas, in the Dallas-Fort Worth metroplex. It is a wholly owned subsidiary of American Airlines Group that, along with several carriers outside the group, feeds the American Airlines route network under the American Eagle brand. With over 1,800 flights a day, serving 159 cities across the United States, Canada, Mexico and the Caribbean, Envoy is considered to be the world's largest regional airline system. Envoy is an affiliate member of the Oneworld airline alliance.
Document 15: Air Wisconsin: Air Wisconsin Airlines is a regional airline based at Appleton International Airport in the town of Greenville, Wisconsin, United States, near Appleton. Air Wisconsin is the largest privately held regional airline in the United States. It currently operates regional jet flights as American Eagle under contract to American Airlines via a code sharing agreement, serving cities in the U.S. and Canada with hubs at Boston Logan International Airport (BOS), Charlotte Douglas International Airport (CLT), Philadelphia International Airport (PHL) and Ronald Reagan Washington National Airport (DCA) . Air Wisconsin previously operated United Express service on behalf of United Airlines followed by US Airways Express service on behalf of US Airways prior to becoming an American Eagle regional air carrier. The company has announced it will once again partner with United Airlines as a United Express code sharing air carrier with primary hubs to be located at Chicago O'Hare International Airport (ORD) and Washington Dulles International Airport (IAD) beginning in September 2017 and will be "exclusively operating" as United Express by March 2018.
ground_truth: Keith Houk