Question: Which unitary authority area in Yorkshire houses the RAF North Killingholme just west of it?

Context paragraphs:
Ulceby Aerodrome Platform railway station: Ulceby Aerodrome Platform railway station was situated 74 chain north east of Ulceby North Junction between Ulceby and the village of South Killingholme, Lincolnshire, England.  It was opened by LNER to serve the Second World War airfield RAF North Killingholme, whose southern perimeter lay a short distance to the north.

East Riding of Yorkshire: The East Riding of Yorkshire, or simply East Yorkshire, is a ceremonial county of England.  It is located in the region of Yorkshire and the Humber.  The East Riding of Yorkshire may also refer to a local government district with unitary authority status, which does not include the city of Kingston upon Hull, the largest settlement in the ceremonial county, which is a separate unitary authority.  The modern East Riding of Yorkshire (both ceremonial county and unitary authority), was formed in 1996 from the northern part of the non-metropolitan county of Humberside.

North Lincolnshire: North Lincolnshire is a unitary authority area in the region of Yorkshire and the Humber in England.  The population of the Unitary Authority at the 2011 census was 167,446.  For ceremonial purposes it is part of Lincolnshire.  There are three significant towns: Scunthorpe (the administrative centre), Brigg and Barton-upon-Humber.

Llwyn-on Reservoir: Llwyn-on Reservoir is the largest and southernmost of the three reservoirs in the Taff Fawr valley in South Wales.  It is owned by Welsh Water.  It is located in the Brecon Beacons National Park.  The eastern half is in the Merthyr Tydfil unitary authority area and the western half is in the Rhondda Cynon Taff unitary authority area.  The reservoir is within the historic county boundaries of Breconshire.  The dam is adjacent to Llwyn-On village.

Cantref Reservoir: Cantref Reservoir is the middle of the three reservoirs in the Taff Fawr valley in Wales.  It is owned by Welsh Water.  It is located in the Brecon Beacons National Park, mostly in the Powys unitary authority area and within the historic county boundaries of Breconshire.  Part of the south west corner is in the Rhondda Cynon Taff unitary authority area.

Blackburn with Darwen: Blackburn with Darwen is a unitary authority area in Lancashire, North West England.  It consists of Blackburn, the small town of Darwen to the south of it, and the surrounding countryside.  The population of the Unitary Authority taken at the 2011 census was 147,489.

North East Lincolnshire: North East Lincolnshire is a unitary authority area in the Yorkshire and the Humber region of England, bordering the unitary authority of North Lincolnshire and the non-metropolitan county of Lincolnshire.  The population of the Unitary Authority at the 2011 Census was 159,616.  These three administrative units make up the ceremonial county of Lincolnshire.

Borough of Halton: Halton is a local government district in the ceremonial county of Cheshire in North West England, with borough status and administered by a unitary authority.  It was created in 1974 as a district of the non-metropolitan county of Cheshire, and became a unitary authority area on 1 April 1998.  Since 2014 it has been a member of the Liverpool City Region Combined Authority.  The borough consists of the towns of Runcorn and Widnes and the civil parishes of Hale, Daresbury, Moore, Preston Brook, Halebank and Sandymoor.  The district borders Merseyside, Warrington and Cheshire West and Chester.  The borough straddles the River Mersey – the area to the north (including Widnes) is historically part of Lancashire, that to the south (including Runcorn) part of Cheshire.

RAF North Killingholme: Royal Air Force North Killingholme or more simply RAF North Killingholme is a former Royal Air Force station located immediately west of the village of North Killingholme in North Lincolnshire.

Borough of Darlington: Darlington is a unitary authority area in the ceremonial county of County Durham, north-east England.  It borders the non-metropolitan county of County Durham to the north and west, Stockton-on-Tees to the east and North Yorkshire to the south along the line of the River Tees.  The urban centre and the base of the borough is the town of Darlington.  In 2011 it had a resident population of 106,000.  The borough is a member of the Tees Valley combined authority area.

Supporting paragraphs: RAF North Killingholme North Lincolnshire
Answer: North Lincolnshire