Article 43 Montreal Convention
Article 43 of the Montreal Convention (Convention For the Unification of Certain Rules for International Carriage by Air) is titled Servants and Agents. It is under Chapter V (Carriage by Air Performed by a Person other than the Contracting Carrier).
In relation to the carriage performed by the actual carrier, any servant or agent of that carrier or of the contracting carrier shall, if they prove that they acted within the scope of their employment, be entitled to avail themselves of the conditions and limits of liability which are applicable under this Convention to the carrier whose servant or agent they are, unless it is proved that they acted in a manner that prevents the limits of liability from being invoked in accordance with this Convention.
See also: Article 42 Montreal Convention