London Heathrow Airport has announced a reorganisation of airline terminal allocations, scheduled to take place in 2028. The changes will affect five airlines, including Delta Air Lines, Finnair, Japan Airlines, China Southern Airlines and LATAM Airlines. Although relatively few carriers are involved, the decision has already sparked criticism, primarily because it will separate Delta’s operations from those of its strategic partner, Virgin Atlantic.

Under the announced arrangements, Delta Air Lines, Finnair and Japan Airlines will move their operations from Terminal 3 to Terminal 4. China Southern Airlines will leave Terminal 4 and relocate to Terminal 5, while LATAM Airlines will transfer its flights from Terminal 3 to Terminal 2. Other airlines are expected to retain their existing terminal allocations.

Heathrow management says the reorganisation follows several years of analysis of terminal capacity utilisation and consultations with airlines. The main objectives are to distribute passenger traffic more evenly, reduce congestion during peak periods and make more efficient use of existing infrastructure. Heathrow is one of Europe’s busiest airports, and opportunities to increase capacity are currently limited by its existing infrastructure. Terminal 3 experiences particularly high demand during peak periods, making its decongestion one of the key objectives of the planned changes.

According to information released by the airport, several possible reorganisation scenarios were considered over the past three years. The selected solution requires the fewest airline relocations and the lowest additional capital investment. The plan is supported by airlines representing approximately 81 percent of Heathrow’s passenger traffic. The five carriers affected by the changes collectively account for less than four percent of the airport’s total traffic. Nevertheless, their relocation is expected to free up capacity at the busiest terminals and improve passenger flow management.

The decision attracting the most attention is Delta’s relocation to Terminal 4, which will physically separate the American carrier from Virgin Atlantic, which will remain at Terminal 3. Delta and Virgin Atlantic cooperate closely on transatlantic routes, coordinating schedules and ticket sales while offering passengers connections across their joint network. Delta also holds a 49 percent ownership stake in Virgin Atlantic, and both airlines are members of the SkyTeam alliance.

Separating their operations could complicate connections between the two airlines, particularly for passengers travelling between North America and other international destinations via London. Instead of transferring within the same terminal, passengers will have to use inter-terminal transport, potentially increasing overall connection times.

Virgin Atlantic CEO Corneel Koster has strongly criticised the decision, warning that it could weaken the competitiveness of the joint network, reduce passenger choice and ultimately lead to higher airfares. Virgin Atlantic has announced that it is considering options to challenge the decision. Notably, competing transatlantic partners British Airways and American Airlines will retain their existing terminal arrangements, while Delta and Virgin Atlantic will be separated.

Nevertheless, Delta’s relocation also has a certain operational rationale. Terminal 4 already accommodates Air France and KLM, Delta’s partners within the SkyTeam alliance and their transatlantic joint venture. The move could therefore improve connectivity between Delta and these European carriers, although it would simultaneously disrupt the existing integration with Virgin Atlantic.

The reorganisation will affect not only connections but also the travel experience of premium passengers and frequent flyers. Delta passengers who currently qualify for access to the Virgin Atlantic Clubhouse at Terminal 3 will lose that benefit following the relocation. The Clubhouse is widely regarded as one of Heathrow’s better premium lounges, while another advantage is the dedicated premium check-in facility known as the Upper Class Wing.

Finnair and Japan Airlines will also leave Terminal 3, which houses several lounges operated by oneworld alliance members, including American Airlines, British Airways, Cathay Pacific and Qantas. Following their relocation to Terminal 4, passengers will have access to different lounge facilities. Among the most notable is the Qatar Airways Premium Lounge, available to eligible business and first class passengers travelling with oneworld airlines. Access for frequent flyers with elite status travelling in economy class will depend on the specific lounge access rules, with Terminal 4 also offering a separate Qatar Airways Frequent Flyer Lounge.

Unlike Delta’s relocation, China Southern Airlines’ move to Terminal 5 could bring certain advantages. The Chinese carrier cooperates with British Airways, which uses Terminal 5 as its main operating base at Heathrow. Bringing the two airlines together at the same terminal should simplify connections and facilitate coordination between their services.

LATAM Airlines will relocate to Terminal 2, which is primarily used by Star Alliance members, although LATAM itself is not part of the alliance. Given the South American carrier’s relatively limited operations at Heathrow, its relocation is expected to have a smaller impact on the airport’s overall operations.

The changes to airline terminal allocations form part of Heathrow’s broader efforts to improve the efficiency of its existing infrastructure ahead of larger development projects. The airport has already announced investments in the modernisation of Terminal 4, including refurbishment of check-in areas, improvements to terminal access and the construction of a new multi-storey car park. The works are planned in phases, with completion expected in 2031. At the same time, investments in baggage handling systems and other parts of the airport’s infrastructure are continuing.

In the longer term, Heathrow is also considering a substantial expansion of capacity, including the construction of a third runway. However, until such major infrastructure projects are realised, airport management is seeking to increase the throughput of existing terminals without extensive construction work.

The announced reorganisation demonstrates how airline terminal allocations at major international hubs can influence commercial relationships, competitiveness and the passenger experience. Although Heathrow presents the changes as a necessary step towards more efficient operations, Virgin Atlantic’s opposition highlights how a solution considered operationally optimal by an airport operator may not necessarily align with the interests of all airlines and their passengers. Whether the proposed arrangements will be implemented without modifications will also depend on the outcome of any potential challenges by Virgin Atlantic and Delta during preparations for the relocations.