United International Airlines

United International Airlines was the Serbian name used by the former Bulgarian charter carrier Air Sofia after Bulgarian authorities prohibited Air Sofia's operations in March 2007. Air Sofia had begun operations on 1 February 1992 and was based at Sofia Airport. Its business centered on charter flying rather than a scheduled network, with reported services to destinations in Europe, Africa, the Far East, South America, and the Middle East. The airline also made aircraft available to other operators through dry-lease and wet-lease arrangements. The company was associated with a mixed fleet that, at various points, included Antonov An-12 and An-24 aircraft, a Boeing 737-800, and light aircraft used for training. The reported fleet in January 2005 comprised six Antonov An-12s, one Antonov An-24, one Boeing 737-800, a Cessna 172, and a Piper PA-44 Seminole. The Boeing aircraft was disposed of in April 2005, before the later relocation and rebranding process. On 5 March 2007, Bulgaria prohibited the operations of five Bulgarian air carriers, including Air Sofia. In the weeks that followed, the airline relocated its operations to Serbia and adopted the United International Airlines name. The available reference material does not establish the exact Serbian operating base, ownership structure, route list, or duration of operations under the new name. It also does not document a sustained scheduled passenger service under United International Airlines. Air Sofia established a flight-training organization on 6 August 2008 in accordance with Joint Aviation Requirements–Flight Crew Licensing standards. The associated training activity offered instruction toward Private Pilot Licence, Commercial Pilot Licence, Airline Transport Pilot Licence, and Multi-Crew Cooperation qualifications. Because the available material describes the training organization under the Air Sofia name rather than clearly attributing all later activity to United International Airlines, the relationship between the Serbian airline brand and the training operation should be treated cautiously. The subject is best understood as a successor or relocated identity connected to Air Sofia's charter and aviation-services business, rather than as a large international scheduled airline.

United International Airlines is documented as the Serbian successor identity of Air Sofia, a Bulgarian charter airline established in 1992. Air Sofia began operations on 1 February 1992 and was based at Sofia Airport. Its activities covered charter passenger flights and aviation services rather than a conventional scheduled-airline network. The airline reportedly served charter destinations in Europe, Africa, the Far East, South America, and the Middle East. It also leased aircraft to other carriers and conducted wet-lease operations, supplying both aircraft and operating services. The airline was owned by Georgi Ivanov, identified as managing director, and Lilian Todorov, identified as president. By March 2007, Air Sofia reportedly employed approximately 150 people. Its fleet history reflected the varied nature of its operations. A January 2005 fleet listing included six Antonov An-12 aircraft, one Antonov An-24, one Boeing 737-800, a Cessna 172, and a Piper PA-44 Seminole. The Boeing 737-800 was disposed of in April 2005. The Antonov aircraft were suitable for the carrier's broader charter and cargo-related aviation profile, while the smaller aircraft were associated with training and general aviation activities. A major turning point came on 5 March 2007, when Bulgaria prohibited five Bulgarian air carriers from operating, including Air Sofia. The available account does not provide the detailed legal or safety grounds for the decision, but it records that Air Sofia moved to Serbia in the following weeks. The relocated operation adopted the United International Airlines name, making the Serbian brand a continuation or successor of the earlier Bulgarian business. Publicly available information in the supplied reference does not specify the exact Serbian city of registration or base, the corporate mechanics of the transfer, or the complete operating history under the new name. The business was also connected with professional flight education. On 6 August 2008, Air Sofia established a flight-training organization compliant with Joint Aviation Requirements–Flight Crew Licensing rules. The organization offered training for the Private Pilot Licence, Commercial Pilot Licence, Airline Transport Pilot Licence, and Multi-Crew Cooperation qualifications. This indicates that the broader aviation business extended beyond passenger charter and leasing into pilot education. However, the reference material labels this activity Air Sofia and does not definitively state whether it remained legally or operationally part of United International Airlines after the Serbian relocation. The available source identifies United International Airlines as a defunct Serbian airline. It does not provide a confirmed cessation date, a detailed Serbian fleet list, a current corporate successor, or evidence of a long-running scheduled passenger network. Consequently, the brand is best characterized as a short-lived or poorly documented Serbian operating identity associated with Air Sofia's charter, leasing, and training activities. Its historical significance lies principally in the relocation and renaming that followed Bulgaria's 2007 operating prohibition.

• 2008

  Flight-training organization established

  [1]Air Sofiaen.wikipedia.org

  An associated Air Sofia flight-training organization was established on 6 August 2008 under JAR-FCL standards.

• 2007

  Bulgarian operating prohibition

  [1]Air Sofiaen.wikipedia.org

  Bulgaria prohibited the operations of five carriers, including Air Sofia, on 5 March 2007.

• 2007

  Relocation to Serbia

  [1]Air Sofiaen.wikipedia.org

  Following the Bulgarian prohibition, Air Sofia relocated to Serbia and operated under the United International Airlines name.

• 2005

  Reported mixed fleet

  [1]Air Sofiaen.wikipedia.org

  A January 2005 fleet listing recorded Antonov An-12 and An-24 aircraft, a Boeing 737-800, and smaller Cessna and Piper aircraft.

• 1992

  Air Sofia begins operations

  [1]Air Sofiaen.wikipedia.org

  The predecessor airline began operations on 1 February 1992 from Sofia, Bulgaria, focusing on charter aviation and related services.

A small aviation-services operator focused on charter flying, aircraft leasing and wet leasing, and professional pilot training rather than a broad scheduled passenger network.

• Air transport · 1992

  Charter passenger flights

  The airline's core transport activity was charter flying rather than a published scheduled network. Reported charter destinations covered Europe, Africa, the Far East, South America, and the Middle East.

• Aviation services

  Aircraft leasing and wet leasing

  United International Airlines was associated with making aircraft available to other airlines through leasing arrangements, including wet leases in which the aircraft operation was supplied together with the aircraft.

• Aviation education · 2008

  Pilot training

  The associated flight-training organization provided instruction toward Private Pilot Licence, Commercial Pilot Licence, Airline Transport Pilot Licence, and Multi-Crew Cooperation qualifications under JAR-FCL standards.

• 2007

  Relocation and rebranding as United International AirlinesStrategy

  Background

  Bulgarian authorities prohibited Air Sofia's operations on 5 March 2007 as part of action against five Bulgarian air carriers.

  Action taken

  The airline relocated to Serbia in the following weeks and used the United International Airlines name.

  Aftermath

  The move created the Serbian identity documented as United International Airlines. The available source does not establish how long the renamed operation continued or identify a later corporate successor.

  Source

• 2008

  Associated flight-training organization established[1]Air Sofiaen.wikipedia.org

  Other

  Air Sofia established a flight-training organization on 6 August 2008 under Joint Aviation Requirements–Flight Crew Licensing standards, offering training for PPL, CPL, ATPL, and MCC qualifications.

• 2007

  Bulgaria prohibits Air Sofia operations[1]Air Sofiaen.wikipedia.org

  Regulation · Other

  On 5 March 2007, Bulgarian authorities prohibited the operations of five Bulgarian air carriers, including Air Sofia. The action was followed by the airline's relocation to Serbia and use of the United International Airlines name.

• 2007

  Air Sofia relocates to Serbia and adopts United International Airlines name[1]Air Sofiaen.wikipedia.org

  Other

  In the weeks after the Bulgarian operating prohibition, Air Sofia relocated to Serbia and continued under the United International Airlines identity.

1. 1Air Sofiaen.wikipedia.org