Question: What year was the act which ended scheduled airland service at London-Corbin Airport passed?

Context paragraphs:
London-Corbin Airport: London-Corbin Airport (IATA: LOZ, ICAO: KLOZ, FAA LID: LOZ) , also known as Magee Field, is a general aviation airport located in Laurel County, Kentucky, three nautical miles (6 km) south of the central business district of London and about 12 miles north of Corbin.  The airport is operated by both cities.  It is not currently served by scheduled airline service, though service was once available on US Airways Express dba Air Kentucky and Tennessee Airways.  Prior to the passage of the Airline Deregulation Act, the airport was served by Piedmont Airlines (1948-1989) turboprops, including the Fairchild Hiller FH-227 and the NAMC YS-11.

Jack Brooks Regional Airport: Jack Brooks Regional Airport (IATA: BPT, ICAO: KBPT, FAA LID: BPT) , formerly Southeast Texas Regional Airport, is near Port Arthur, Texas, nine miles (14 km) southeast of Beaumont and northeast of Port Arthur.  It was formerly the Jefferson County Airport, but its name was changed to honor former U.S. Representative Jack Brooks (D - Beaumont).  The airport is southwest of the city of Nederland in unincorporated Jefferson County, and is used for general aviation.  Southwest Airlines ended scheduled service (in 1980).  A number of other airlines have also initiated and then ceased service including American Eagle, Continental, Delta/Delta Connection and United Express.  The latest chapter with regard to passenger airline service at the airport involves the resumption of service by American Eagle on behalf of American Airlines to Dallas/Ft.  Worth (DFW).

Declaratory Act 1719: An Act for the better securing the dependency of the Kingdom of Ireland on the Crown of Great Britain (6.  Geo.  I, c. 5) was a 1719 Act passed by the Parliament of Great Britain which declared that it had the right to pass laws for the Kingdom of Ireland, and that the British House of Lords had appellate jurisdiction for Irish court cases.  It became known as the Declaratory Act, and opponents in the Irish Patriot Party referred to it as the Sixth of George I (from the regnal year it was passed).  Legal and political historians have also called it the Dependency of Ireland on Great Britain Act 1719 or the Irish Parliament Act, 1719.  Prompted by a routine Irish lawsuit, it was aimed at resolving the long-running dispute between the British and the Irish House of Lords as to which was the final court of appeal from the Irish Courts.  Along with Poynings' Law, the Declaratory Act became a symbol of the subservience of the Parliament of Ireland, and its repeal was long an aim of Irish statesmen, which was finally achieved as part of the Constitution of 1782.

Inverness Airport: Inverness Airport (Scottish Gaelic: "Port-adhair Inbhir Nis" ) (IATA: INV, ICAO: EGPE) is an international airport situated at Dalcross, 7 NM north-east of the city of Inverness, Scotland.  It is owned by Highlands and Islands Airports Limited (HIAL).  The airport is the main gateway for travellers to the north of Scotland with a range of scheduled services throughout the United Kingdom, and limited scheduled service to Continental Europe.  Limited charter and freight flights operate throughout the UK and Europe.  Around 780,000 passengers passed through the airport in 2016.

Airline Deregulation Act: The Airline Deregulation Act is a 1978 United States federal law that deregulated the airline industry in the United States, removing U.S. Federal Government control over such areas as fares, routes and market entry of new airlines, introducing a free market in the commercial airline industry and leading to a great increase in the number of flights, a decrease in fares, and an increase in the number of passengers and miles flown.  The Civil Aeronautics Board's powers of regulation were phased out, but the Act did not diminish the regulatory powers of the Federal Aviation Administration (FAA) over all aspects of aviation safety.

First Succession Act: The First Succession Act of Henry VIII's reign was passed by the Parliament of England in March 1534.  The Act was formally titled the Succession to the Crown Act 1533 (citation 25 Hen 8 c 22), or the Act of Succession 1533; it is often dated as 1534, as it was passed in that calendar year.  However, the legal calendar in use at that time dated the beginning of the year as March 25, and so considered the Act as being in 1533.

Langley Regional Airport: Langley Regional Airport (IATA: YLY, ICAO: CYNJ) is located in Langley Township, British Columbia, Canada.  The airport serves mostly general aviation, and also provided scheduled passenger service to the Victoria Airport Water Aerodrome via Harbour Air Seaplanes before service was ended on May 20, 2011.  Helicopter operations are a major part of Langley Airport's traffic; the airport has 3 helipads.

Intercontinental de Aviación Flight 256: Intercontinental de Aviación Flight 256 was a scheduled flight from El Dorado International Airport, Bogotá on a service to Rafael Núñez International Airport, Cartagena and San Andrés.  The flight was scheduled to depart at 12:10 but was delayed due to a failure on the previous flight.  The flight eventually departed at 18:45.  During the approach to Cartagena the aircraft passed through FL200 20000 ft at 19:33.  The last radio contact occurred when the flight was cleared further down to 8000 ft .  The plane impacted with the ground in a marshy lagoon near María La Baja, 56 km from Cartagena Airport.  The probable cause of the crash was a wrong setting of the altimeter.  Altimeter number 1 indicated 16200 ft on impact.

Integra Air: Integra Air offers chartered and scheduled flight services, as well as air ambulance medivac services out of Lethbridge, Alberta.  Its scheduled service provides flights between Edmonton International Airport, Cranbrook/Canadian Rockies International Airport, Lethbridge Airport, Medicine Hat Airport, Calgary International Airport, and Bonnyville Airport.  Its chartered service flies throughout North America.  Its medivac services are provided on contract to the provincial government of Alberta, Canada, providing service to communities in Alberta, Saskatchewan, and British Columbia 24 hours a day.

Treason Act 1541: The Treason Act 1541 (33 Hen.8 c.20) was an Act of the Parliament of England passed in 1542 (acts of Parliament were backdated to the year in which the session of Parliament had begun, rather than the year in which the Act was actually passed).  It provided for the trial and punishment of lunatics for high treason.  The reason given for passing the Act was given by the Act itself, which stated "it is a thing almost impossible certainly to judge" whether a defendant's madness was real or feigned.

Supporting paragraphs: London-Corbin Airport Airline Deregulation Act
Answer: 1978