Subject to AS 45.12.404 on substituted performance, the following rules apply:
(1) delay in delivery or nondelivery in whole or in part by a lessor or a supplier who complies with (2) and (3) of this section is not a default under the lease contract if performance as agreed has been made impracticable by the occurrence of a contingency the nonoccurrence of which was a basic assumption on which the lease contract was made or by compliance in good faith with an applicable foreign or domestic governmental regulation or order, whether or not the regulation or order later proves to be invalid;
(2) if the causes mentioned in (1) of this section affect only part of the lessor's or the supplier's capacity to perform, the lessor or supplier shall allocate production and deliveries among the customers of the lessor or supplier but at the option of the lessor or supplier may include regular customers not then under contract for sale or lease as well as the requirements of the lessor or supplier for further manufacture; the lessor or supplier may allocate under this paragraph in a manner that is fair and reasonable;
(3) the lessor seasonably shall notify the lessee and in the case of a finance lease the supplier seasonably shall notify the lessor and the lessee, if known, that there will be delay or nondelivery and, if allocation is required under (2) of this section, of the estimated quota made available for the lessee.