There was a suggestion of that - It came with quite a few disadvantages:
- It would require major investment in local infrastructure (roads, railways, schools, hospitals) in order to service the tens of thousands of employees at a major airport.
- There would be considerable upheaval involved in moving London's main airport to a new location, though other major cities have successfully moved their main airports, including Paris (1974), Singapore (1981), Jakarta (1985), Munich (1992), Denver (1995), Oslo (1998), Hong Kong (1998), Kuala Lumpur–International (1998), Athens (2001), Bangkok (2006) and Doha (2013)[18] while other cities, such as Montréal, have had difficulty with such a transition.
- There would be significant job losses at Heathrow, and knock-on impacts to the economy of west London.
- Fog would be a key difficulty to overcome for a possible hub airport. In 2012, the Met Office concluded that the Thames Estuary was 'three times' more foggy than Heathrow.[31] Fog and snow frequently affect flights at Heathrow, forcing aircraft to leave more space for take-off and landing due to low visibility.[32] Whereas a Thames estuary airport could transfer travellers by Eurostar and new fog guidance systems can be used to overcome these issues, however Heathrow has not yet installed them.
- The construction costs of the airport alone would be large, estimated at £11.5 billion for Cliffe, and £3.5 billion more for an offshore island scheme.
- There would be large costs for constructing road and rail access to the airport. These were estimated at £1.8 billion for Cliffe, including two rail connections to High Speed 1, a road tunnel under the Thames to Benfleet, largely to access the south east Essex labour market, and other road and rail connections. Heathrow rely on public transport and funding for transport infrastructure; major upgrades are also required and need to be considered for rail and motorways.
- Proposals rely on using capacity on High Speed 1; however, it currently only uses under 10% of its full potential.
- Building an artificial offshore island can be expanded; however is time-consuming, adding 3 to 5 years to the construction time.
- There is a risk of bird strike, higher for coastal sites, lower for offshore sites.
- The level of demand for an airport in the Thames estuary is uncertain, and may require government intervention to force airlines to use it.
- The massive skilled, semi- and unskilled workforce that a new airport would require (currently all situated in or near West London)
- Building a major new airport to expand capacity may encourage more flights, and thereby increase emissions of CO2 and other greenhouse gases, unless a channel tunnel is connected to replace many flights.
- The presence of the wreck of the SS Richard Montgomery, which has around 1,400 tons of explosives on board. A safe way to remove the wreck, present since 1944, has not yet been found.
- It would require a radical upgrade to the current flight patterns which are based on 1970s patterns, and the proximity to Dutch and Belgian airspace may cause knock-on effects in other countries if not planned properly like Heathrow.
- The South East of England (SE) is already highly developed, with a population density reported (in 2011) as the third (or sixth, by other criteria) most dense in the world. Many areas of the SE already have three or four layers of audible air traffic over them.
- The location would be more difficult to access from the rest of the country compared to Heathrow.
- Building the airport would destroy the habitat of thousands of wetland birds.
- The airport would be placed in the flight path of four of London's five major airports (Heathrow, Gatwick, Stansted, and London-City).
- London Southend Airport would have to close down. Due to its close proximity from the planned airport sites.
- A 2012 report by the South East Local Enterprise Partnership prepared by Parsons Brinckerhoff concluded that they "do not believe that [the Thames Estuary Airport] is a viable solution to the capacity issues facing the SE." in the short term, but "applaud the fact that a long term solution is being seriously discussed".[33]
- Infrastructure - building of new main airport (and the required supporting industrial, technical and hospitality activities) may be very costly, especially to achieve the same position and size of terminals and technologies like in case of Heathrow or Dubai ports, where, despite cheap sand start place, the cost of all was very big.
- Travel to London ticket price. Unknown is how much the ticket may cost, and if the airport would be at position of London tariff schemes. The position of Heathrow as part of the London underground system is often cited as a cost and time difference. For an average traveller usually the time and cost to travel into city centre would be main reason of choosing. Location in the deep sea may be treated as an advantage for most people, only if the travel time (at least by public transport) would be faster or similar that from LHR, and would cost less, or for e.g. be fared like usual Zone 1 ticket.[34][35][36][37]
- The proximity of Amsterdam's Schiphol airport would also affect traffic patterns and force aircraft into more circuitous flight paths.[38]
- The potential interference with one of the busiest shipping routes in Europe.[39]









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