Fly4 Airlines

Fly4 Airlines is an Irish airline focused on ACMI and charter operations rather than direct-to-consumer scheduled ticket sales. Its name refers to an operating platform created by Polish charter carrier Enter Air and German tourism group TUI Group to provide flexible aircraft capacity for TUI-related airlines and other carrier customers. The venture was established in August 2023, with Enter Air holding a 51% majority interest and TUI Group holding the remaining 49%. The airline is headquartered at Dublin Airport and operates under an Irish air operator's certificate. The Irish Aviation Authority granted Fly4 its air operator's certificate on 5 March 2024, and the carrier began flying on 10 March 2024 with four Boeing 737-800 aircraft. Its operating model is based primarily on ACMI wet leasing, in which the airline supplies aircraft, crew, maintenance and insurance to another airline. It also undertakes charter work. This structure allows customer airlines to add capacity during seasonal peaks, cover fleet shortages, or support network growth without permanently acquiring additional aircraft and operating infrastructure. Fly4's initial and most prominent customer relationship has been with TUI Airways. During the 2025 summer season, Fly4 expanded its support for TUI Airways operations at Birmingham, East Midlands and Norwich. The airline has also operated for other European carriers, including Sundair, demonstrating that its commercial scope is not limited to the TUI group. Because it generally flies on behalf of contracting airlines, the destinations served by Fly4 can change according to lease agreements and customer requirements rather than forming a stable independent route network. The airline's operating footprint has included destinations in Europe and North Africa, with a later expansion plan involving Asia. In late 2025, Fly4 announced a winter ACMI agreement with India's SpiceJet under which aircraft would be based in Delhi. This represented a significant geographic extension beyond its European operating base and illustrated the flexibility of the ACMI model. Fly4 Airlines is therefore positioned as a capacity and operations partner in the airline industry rather than as a conventional consumer-facing network or low-cost carrier. Its value proposition is the provision of aircraft and operational personnel at short notice or for defined seasonal periods. The venture combines Enter Air's charter-airline operating expertise with TUI's large tourism and airline ecosystem. Public information about its executive leadership, detailed fleet composition beyond the initial four Boeing 737-800 aircraft, financial performance and long-term network remains limited.

Fly4 Airlines was created in August 2023 as a strategic joint venture between Enter Air and TUI Group. Enter Air, a Polish charter airline, owns 51% of the venture, while TUI Group owns 49%. The partnership was designed to address the need for flexible airline capacity, particularly during seasonal demand peaks and periods when customer airlines require additional aircraft without committing to long-term fleet expansion. The venture was established around the ACMI model. Under an ACMI arrangement, the provider supplies the aircraft, crew, maintenance and insurance, while the customer airline generally retains responsibility for commercial activities such as branding, ticket sales and much of the passenger-facing network planning. Fly4 also operates in the charter segment. This business model distinguishes it from airlines that primarily sell seats under their own brand and publish a fixed scheduled route network. Fly4 obtained its Irish air operator's certificate from the Irish Aviation Authority on 5 March 2024. It began operations five days later, on 10 March 2024, with four Boeing 737-800 aircraft. Dublin Airport serves as the airline's headquarters. Its Irish regulatory base gives the venture an operating platform within the European aviation market while its ownership connects it to both Enter Air's charter expertise and TUI's tourism and airline businesses. TUI Airways was Fly4's principal launch customer. As the operation developed, Fly4 supplied capacity for TUI Airways and also undertook work for other European airlines, including Sundair. Its aircraft have served destinations across Europe and North Africa according to the requirements of its contracting partners. Since Fly4's aircraft are deployed through wet-lease and charter agreements, the airline's operational geography is variable and should not be interpreted as a conventional independently marketed route map. The carrier expanded its role during the 2025 summer season by supporting TUI Airways activity at Birmingham, East Midlands and Norwich. This development reflected the seasonal nature of leisure aviation, in which airlines and tour operators often need additional lift during concentrated summer travel periods. In late 2025, Fly4 announced a winter ACMI agreement with SpiceJet, involving an aircraft base in Delhi. The arrangement represented the airline's first major international expansion outside Europe and extended its prospective operating reach into South Asia. It also showed how Fly4's business model can be applied to customers outside the ownership group and outside its initial European market. As of the available reference information, Fly4 remains an active specialist airline whose primary function is to provide operational capacity to other carriers. Its public profile is centered on fleet deployment, wet leasing and charter partnerships rather than consumer marketing. Detailed information about its full current fleet, leadership team, financial performance and longer-term corporate strategy is not established in the supplied material.

• 2025

  Expanded TUI Airways support

  [1]Fly4 Airlinesen.wikipedia.org

  Fly4 supports additional TUI Airways activity from Birmingham, East Midlands and Norwich during the summer season.

• 2025

  Planned Delhi-based SpiceJet ACMI operation

  [1]Fly4 Airlinesen.wikipedia.org

  Fly4 announces a winter ACMI agreement with SpiceJet involving aircraft based in Delhi.

• 2024

  Irish air operator's certificate granted

  [1]Fly4 Airlinesen.wikipedia.org

  The Irish Aviation Authority issues Fly4 its air operator's certificate on 5 March.

• 2024

  Commercial operations begin

  [1]Fly4 Airlinesen.wikipedia.org

  Fly4 starts operations on 10 March with four Boeing 737-800 aircraft.

• 2023

  Fly4 Airlines is established

  [1]Fly4 Airlinesen.wikipedia.org

  Enter Air and TUI Group establish Fly4 Airlines as a joint venture focused on ACMI and charter capacity.

A flexible Irish ACMI and charter operator serving airlines and tourism groups, with an emphasis on seasonal capacity, wet leasing and operational support rather than direct retail ticket sales.

• Airline capacity services · 2024

  ACMI wet-lease services

  Fly4 provides aircraft, crew, maintenance and insurance to contracting airlines. The arrangement enables customers to add capacity for seasonal demand, temporary fleet shortages or specific operating programs while Fly4 manages the core aircraft operation. The service is primarily business-to-business and does not normally involve Fly4 selling tickets directly to passengers.

• Charter aviation · 2024

  Charter airline operations

  In addition to wet leasing, Fly4 undertakes charter operations for airline and tourism-sector customers. Its aircraft can be deployed to destinations selected by contracting partners, allowing the operating pattern to change between seasons and agreements rather than following a fixed consumer route network.

• Narrow-body aircraft operations · 2024

  Boeing 737-800 capacity

  Fly4 began operations with four Boeing 737-800 aircraft. These narrow-body aircraft are suited to the short- and medium-haul European and leisure markets typically served through ACMI and charter contracts.

• 2025

  Expansion into a Delhi-based SpiceJet operationStrategy

  Background

  Fly4 pursued demand outside its initial European market through an international winter ACMI arrangement.

  Action taken

  The airline announced an agreement with SpiceJet to base aircraft in Delhi during the winter period.

  Aftermath

  The agreement marked Fly4's planned first major expansion beyond Europe and broadened its potential customer and operating base.

  Source

• 2024

  Launch of Boeing 737-800 ACMI and charter operationsProduct launch

  Background

  Following receipt of its Irish air operator's certificate, Fly4 needed to establish an operating fleet and begin fulfilling its capacity-support mandate.

  Action taken

  Fly4 commenced operations on 10 March with four Boeing 737-800 aircraft.

  Aftermath

  The airline began providing capacity for TUI Airways and subsequently other European carriers.

  Source

• 2023

  Creation of an ACMI-focused joint ventureStrategy

  Background

  Enter Air and TUI Group sought a dedicated platform for flexible aircraft capacity and seasonal airline support.

  Action taken

  They established Fly4 Airlines, with Enter Air holding 51% and TUI Group holding 49%.

  Aftermath

  The new carrier obtained Irish certification and began serving TUI Airways and other airline customers.

  Source

1. 1Fly4 Airlinesen.wikipedia.org