Treaty of Trianon/Part XI
The aircraft of the Allied and Associated Powers shall have the liberty of passage and landing over and in the territory of Hungary, and shall enjoy the same privileges as Hungarian aircraft, particularly in case of distress.
The aircraft of the Allied and Associated Powers shall, while in transit to any foreign country whatever, enjoy the right of flying over the territory of Hungary without landing, subject always to any regulations which may be made by Hungary, and which shall be applicable equally to the aircraft of Hungary and to those of the Allied and Associated countries.
All aerodromes in Hungary open to national public traffic shall be open for the aircraft of the Allied and Associated Powers, and in any such aerodrome such aircraft shall be treated on a footing of equality with Hungarian aircraft as regards charges of every description, including charges for landing and accommodation.
Subject to the present provisions, the rights of passage, transit and landing provided for in Articles 260, 261 and 262 are subject to the observance of such regulations as Hungary may consider it necessary to enact, but such regulations shall be applied without distinction to Hungarian aircraft and to those of the Allied and Associated countries.
Certificates of nationality, airworthiness, or competency and licences, issued or recognised as valid by any of the Allied or Associated Powers, shall be recognised in Hungary as valid and as equivalent to the certificates and licences issued by Hungary.
As regards internal commercial air traffic, the aircraft of the Allied and Associated Powers shall enjoy in Hungary most favoured nation treatment.
Hungary undertakes to enforce the necessary measures to ensure that all Hungarian aircraft fiying over her territory shall comply with the Rules as to lights and signals, Rules of the Air and Rules for Air Traffic on and in the neighbourhood of aerodromes, which have been laid down in the Convention relative to Aerial Navigation concluded between the Allied and Associated Powers.
The obligations imposed by the preceding provisions shall remain in force until January 1, 1923, unless before that date Hungary shall have been admitted into the League of Nations or shall have been authorised by consent of the Allied and Associated Powers to adhere to the Convention relative to Aerial Navigation concluded between those Powers.