Every company running its business is definitely required to be able to carry out its business processes effectively and efficiently. Likewise with PT. GMF Aeroasia tbk is an MRO company of the Republic of Indonesia. In its business process. The company faces a lot of homework to be done well. Especially in a pandemic situation like today. Companies are required to be able to save on purchasing costs both from internal processes and external. This analysis is targeted at the purchase budget and material procurement for aircraft maintenance. Because the purchase and procurement of parts for aircraft maintenance is considered very crucial. Procurement and purchase of aircraft material are still considered inefficient, especially when purchasing aircraft material is mostly imported from abroad and often there are many additional costs and burdens that companies have to bear. By analyzing several factors that cause a lot of costs including lot determination, transportation costs, setup costs for purchasing materials, purchasing time spans, minimum costs, and also the minimum amount of material purchases that can be made by the company. By using the three methods as the title above, namely: Economic Order Quantity, Least Unit Cost, and also Wagner Within Algorithm.

Keywords
Economic Order Quantity, Least Unit Cost, Wagner Within, Transport cost, Set-Up cost, Inventory Cost, Industrial Management