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http://www.aviationpros.com/press_release/12314847/what-does-a-lessor-have-to-do-with-aircraft-technical-management
np.:
Any unexpected findings while receiving the plane or during the delivery to the next lessee may have serious impact on lease conditions or even reduce price of the asset by 15-30%, as stated by findings of AviaAM Leasing. Inability to deliver a plane on the time outlined in the contract may incur substantial penalties and even loss of business. Meanwhile, the plane would spend time idle on the ground, generating loss instead of profit.