Article 37 Montreal Convention
Article 37 of the Montreal Convention (Convention For the Unification of Certain Rules for International Carriage by Air) is titled Right of Recourse against Third Parties. It is under Chapter III (Liability of the Carrier and Extent of Compensation for Damage).
Nothing in this Convention shall prejudice the question whether a person liable for damage in accordance with its provisions has a right of recourse against any other person.
See also: Article 36 Montreal Convention