Lets just say that a significant % discount on Lease Rates makes R8 mill per C-Check insignificant, does it not...? Especially considering that SAX does C-Checks on a monthly basis, so surely they know the costs involved.
SAX has been operating the CRJ's for a long time and have by now seen all they are going to see about the type- this accusation probably has its roots right back when SAX originally got the type and the engines were not getting through to TBO. I hardly think this is an issue anymore.