Whether SA Airways Technical purchases (a) parts and (b) other technical components for aircraft they service, directly from the (i) manufacturers of the items and/or (ii) aircraft manufacturers; if not, what are the details of the (aa) names of suppliers, (bb) contracts concluded with each supplier, (cc) additional costs incurred by not purchasing directly from manufacturers and/or other aircraft manufacturers and (dd) reasons for not procuring parts and technical components directly from manufacturers of the items and aircraft manufacturers in each case?