Question: How many passengers did the airport in The London Borough of Hillingdon have in 2016?
Context: The London Borough of Hounslow (   ) is a London borough in west London, England, forming part of Outer London.  The borough stretches from near Central London in the east to the border with Surrey in the west, covering Chiswick, Brentford, Isleworth and Feltham in addition to Hounslow itself; it borders the boroughs of Richmond upon Thames, Hammersmith and Fulham, Ealing and Hillingdon, plus the Surrey borough of Spelthorne.  Landmarks include Osterley Park, Gunnersbury Park, Syon House, the London Museum of Water & Steam and Chiswick House.  The local authority is Hounslow London Borough Council. Eastcote House Gardens is an area of public parkland in Eastcote, within the London Borough of Hillingdon.  The site covers 3.63 ha and incorporates the walled garden, dovecote and coach house of Eastcote House.  The house was demolished in 1964 by the Ruislip-Northwood Urban District Council (RNUDC), the predecessor of the London Borough of Hillingdon.  At the public's request, the garden and outbuildings were retained and are now maintained by a group of volunteers, the Friends of Eastcote House Gardens, in partnership with the local authority. This list of people from the London Borough of Hillingdon includes residents who were either born or dwelt for a substantial period within the borders of this modern London borough, formed in 1965 by the amalgamation of Hayes and Harlington Urban District, the Municipal Borough of Uxbridge, Ruislip-Northwood Urban District and Yiewsley and West Drayton Urban District in West London.  The 2001 census recorded the population of Hillingdon as 243,006. The London Borough of Hillingdon (   ) is the westernmost borough in Greater London, England which had a population of 273,936 according to the 2011 Census.  It was formed from the districts of Hayes and Harlington, Ruislip-Northwood, Uxbridge, and Yiewsley and West Drayton in the historic county of Middlesex.  Today, Hillingdon is home to Heathrow Airport and Brunel University, and is the second largest of the 32 London boroughs by area. The coat of arms of the London Borough of Hillingdon is the official symbol of the London Borough of Hillingdon.  They use elements from the coats of arms of the four previous districts.  It is described as: Hillingdon Court is a Grade II listed mansion in Hillingdon, within the London Borough of Hillingdon.  Originally built in 1858 as the family home of the Mills family, the mansion has formed part of the ACS Hillingdon International School since 1978.  Much of the remaining grounds came under public ownership in 1928 and have become public parkland and housing. The London Borough of Bexley is a London borough in south-east London, England.  It has common borders with the London Borough of Bromley to the south, the Royal Borough of Greenwich to the west, across the River Thames to the north it borders the London Borough of Havering, the London Borough of Barking and Dagenham and there is a small boundary with the unitary authority of Thurrock in Essex to the north-east.  There is a border with Dartford borough to the east and Sevenoaks district to the south-east, both being in the ceremonial county of Kent.  The London Borough of Bexley is within the Thames Gateway, an area designated as a national priority for urban regeneration.  The local authority is Bexley London Borough Council. Hillingdon London Borough Council is the local authority for the London Borough of Hillingdon in Greater London, England.  It is a London borough council, one of 32 in the United Kingdom capital of London.  Hillingdon is divided into 22 wards, electing a total of 65 councillors.  The council was created by the London Government Act 1963 and replaced four local authorities: Uxbridge Borough Council, Hayes and Harlington Urban District Council, Ruislip-Northwood Urban District Council and Yiewsley and West Drayton Urban District Council. Cranford Countryside Park is a 144-acre public park in Cranford, in the London Borough of Hillingdon, England.  Situated in close proximity to Heathrow Airport, it is bordered by the M4 Motorway to the north, and by the towns of Harlington and Cranford to the South West and South East respectively.  Although its namesake Cranford is within the London Borough of Hounslow, the park itself is geographically in fact part of the London Borough of Hillingdon, as it straddles the southernmost point of this borough.  Despite this, the park is managed under Hounslow's council authority.  Although the park is in an urban location, it is vehicle-accessible only by a small road before a motorway entrance slip, and as such it has been described as a 'hidden gem'. Heathrow Airport (also known as London Heathrow) (IATA: LHR, ICAO: EGLL) is a major international airport in London, United Kingdom.  Heathrow is the second busiest airport in the world by international passenger traffic (surpassed by Dubai International in 2014), as well as the busiest airport in Europe by passenger traffic, and the seventh busiest airport in the world by total passenger traffic.  In 2016, it handled a record 75.7 million passengers, a 1.0% increase from 2015.
Answer: 75.7 million