41 Educational services, namely, conducting conferences and classes, seminars, and workshops in the fields of aircraft and aircraft parts, namely, aircraft and aircraft parts design, certification, operation, maintenance, repair, overhaul, manufacture and spare parts distribution, and distributing course materials in connection therewith; providing on-line books, manuals, magazines and guide books in the fields of aircraft, aircraft parts, avionics, and maintenance, operation, repair, and training associated with aircraft and aerospace products, parts and support equipment