747

Maintenance, repair, modification, and overhaul of aircraft and parts therefor; technical support services, namely, providing technical support and advice in the field of aircraft and parts maintenance, repair, modification, operation and overhaul; aircraft conversion services, namely, converting commercial aircraft to cargo freighters

Educational services in the nature of providing training in the field of use, operation, maintenance, repair, and overhaul of aircraft; educational services in the nature of providing online publications in the form of books, manuals, and guides, all in the field of aircraft and the use, operation, maintenance, repair, and overhaul of aircraft