Over the past year, the UK government has increasingly emphasised the role of airports and aviation in supporting national economic growth, particularly through the movement of people, goods and ideas. The Department for Transport (DfT) estimates that the air transport sector contributes over 14 billion GBP each year to the UK GDP, underlining its central role in the economy. The UK also maintains one of the largest aviation networks globally, with London serving as Europe’s most connected aviation market in terms of routes.

However, this success comes with pressing challenges. Capacity constraints are increasingly limiting the sector’s growth. Heathrow, Europe’s busiest airport by passenger traffic, is operating near full capacity, which can lead to flight delays, reduced competition and a diminished ability to expand connectivity. The UK government is thus working to address airport capacity issues, with several initiatives underway at the capital’s five major gateways: Heathrow, Gatwick, Stansted, Luton and London City.

The government has reaffirmed its policy support for a third runway at Heathrow and continues to treat Heathrow Airport Limited’s northwest runway proposal as the preferred scheme for consideration. This position is being examined alongside the ongoing review of the Airports National Policy Statement (ANPS), which establishes the framework for decisions on new airport capacity.

The revised ANPS is expected to guide future planning applications and environmental assessments associated with Heathrow’s expansion. The government has indicated that a draft updated policy statement is likely to be published for public consultation by summer 2026, followed by a final version and subsequent development consent processes.

Meanwhile, Heathrow Airport has submitted updated expansion proposals, which it describes as ‘shovel ready’ once policy and planning approvals are secured. The scheme would increase annual passenger capacity to around 150 million, compared with the current throughput of approximately 83–84 million passengers, and allow for up to 756,000 aircraft movements per year.

Key elements of the proposal include:

A 3,500-metre third runway located northwest of the existing airfield will be constructed. The runway will be designed to handle aircraft of all sizes and will significantly boost capacity. Realignment of a section of the M25 motorway beneath the runway is also integral to the design.

The plans include the construction of a new terminal complex (T5X) and further development of existing terminals. The Central Terminal Area will be expanded, including the establishment of an enhanced transport interchange and closure of older facilities as needed.

The submitted blueprint currently envisions planning consent by around 2029 and an operational runway by the mid‑2030s if approvals proceed on schedule.

The UK government officially approved Gatwick’s second runway project in September 2025. The plan involves moving Gatwick’s existing standby/emergency runway about 12 metres north, allowing it to operate simultaneously with the main runway to create a second operational runway.

The expansion is privately financed and is projected to enable around 100,000 additional flight movements annually and support substantial economic activity in the region. It is also expected to boost capacity to around 75 million passengers per year by the late 2030s (up from approximately 45 million currently). The project is also considered ‘shovel‑ready’ with construction planning able to proceed.

While the runway is a headline component, Gatwick is also progressing other projects to increase capacity and resilience ahead of the full runway opening. For example, a 140 million GBP extension to Pier 6 is under construction. Once complete (targeted for 2027), it will add eight new aircraft gates, capable of handling an estimated 7.5 million passengers directly at gates, reducing the need for remote stands and bus transfers.

Independent airline network developments, such as Jet2 establishing a new base at Gatwick this year, reflect confidence in the airport’s growth trajectory prior to the runway’s operational launch.

London Stansted is investing 1.1 billion GBP into terminal expansions and improvements to passenger services. Key components include:

The airport has secured planning approval from Uttlesford District Council to raise its annual passenger capacity up to 51 million over the next 20 years. This is up from the previously consented cap of 43 million. The approval enables the efficient use of the airport’s existing single runway, with airlines using larger aircraft to accommodate more people per flight. Full implementation of the new cap is conditional on concluding an agreed S106 community benefits package. If fully implemented, Stansted would become the UK’s second-busiest airport by passenger throughput, ahead of other London airports besides Heathrow.

The UK Secretary of State for Transport granted Development Consent for London Luton Airport’s expansion project in April 2025, authorising an increase in annual passenger capacity from about 18–19 million to up to 32 million passengers per year by the mid-2040s. A significant component of these plans includes building a second terminal.

The approved project also includes expanded facilities for aircraft stands, taxiways and landside support. Furthermore, it incorporates infrastructure to support the expanded capacity, such as surface access adjustments, road improvements and mitigation works.

The scheme involves a phased development over many years, aiming to match demand growth. Expansion is promoted as a significant economic driver, with Luton Rising projecting up to 11,000 new jobs and roughly 1.5 billion GBP in annual economic activity once fully realised.

London City Airport has also received approval for an expansion plan to accommodate up to 9 million passengers annually by 2031, up from 6.5 million currently.

This increase does not raise the annual number of permitted flights, which remains capped. Instead, growth will be enabled by introducing larger, quieter and more efficient aircraft such as the Airbus A320neo, pending Civil Aviation Authority (CAA) approval.

The airport has submitted a formal application to the CAA to revise strict approach/departure procedures so that it can handle Airbus A320neo aircraft. These jets are significantly larger than the Embraer and Airbus A220 currently used at LCY and can carry up to 180 passengers. This introduction would support leisure travel markets and potentially make the airport more appealing to airlines such as easyJet and Wizz Air.

The approval also allows more early morning and weekend flights; however, an extension to the Saturday afternoon operating hours was not authorised, meaning the existing 12:30pm Saturday closure remains in place. The expansion also does not include a runway extension or major new infrastructure. The focus instead remains on making more effective use of existing assets.

To support the capacity uplift, London City Airport is investing in terminal improvements, new aircraft stands and sustainable transport access. The airport is also pursuing ambitions such as becoming a net‑zero carbon airport by 2030 under its sustainability strategy.

While the government has emphasised that expanding airport capacity is a priority, it has also recognised the importance of addressing the environmental impact of aviation by reducing carbon emissions and improving efficiency.

To support this approach, the government has introduced a Sustainable Aviation Fuel (SAF) Mandate aimed at accelerating domestic SAF production and reducing reliance on conventional jet fuel. Alongside this, the Jet Zero Taskforce has been established to coordinate industry, government and academic efforts to develop pathways towards zero-emission flight, including new aircraft technologies and supporting infrastructure.

Operational improvements form another pillar of the strategy. Modernising UK airspace is intended to enable more direct flight paths, cut holding times and improve overall efficiency, with projected carbon savings of more than 12,000 tonnes of CO2 each year. At the local level, updated noise abatement procedures have already reduced exposure to significant aircraft noise around major airports, including Heathrow, by up to 40%, helping to address long-standing community concerns.

Ensuring these initiatives keep pace with expanding capacity will arguably be central to maintaining public support and delivering a more efficient, lower-carbon aviation system.

This article was originally published in the Airport Industry-News magazine.