Bunch of contractual obligations in international private air law is formidable: contracts of sale of aircraft, financial and operative lease agreements, contracts of international carriage of goods and passengers, aircraft mortgage agreements, etc. To each of the contracts particular conflict rules, envisaged in acts on private international law, or unified rules provided for in international instruments such as Regulation (EU) No 593/2008 on the law applicable to contractual obligations (Rome I), the Warsaw Convention of 1929 and the Montreal Convention of 1999 for the Unification of Certain Rules for International Carriage by Air shall be applied 
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