Article 54 Montreal Convention
Article 54 of the Montreal Convention (Convention For the Unification of Certain Rules for International Carriage by Air) is titled Denunciation. It is under Chapter VII (Final Clauses).
1. Any State Party may denounce this Convention by written notification to the Depositary.
2. Denunciation shall take effect one hundred and eighty days following the date on which notification is received by the Depositary.
See also: Article 53 Montreal Convention