Reference code IFE-1004 is a unique identifier assigned to products and services provided by International Flight Equipment (IFE). It is used to identify the type of product or service that has been delivered. For example, if you purchase a seatback entertainment system from IFE, this code would be printed on the invoice or packing slip so that it can easily be tracked for future reference. This code usually consists of four sections: an “IFE” prefix followed by three digits representing the specific product line within the company's inventory list. The last digit indicates whether it is a new install, replacement part, upgrade kit, etc. Additionally, this reference number also serves as confirmation that all necessary paperwork and regulations have been fulfilled before delivery takes place - providing customers with peace of mind when making any purchases from International Flight Equipment.