ARG/US International has announced acceptance of the International Standards for Business Aircraft Operations (IS-BAO) to meet the audit requirements of its charter operator rating system. IS-BAO is managed by the International Business Aviation Council (IBAC). The acceptance by ARG/US is considered a significant advance toward a single audit standard for business aircraft operators. Charter operators often must  undergo multiple audits to satisfy requirements of different customers. From now on, ARG/US will accept successful IS-BAO Stage I audits from any qualified IS-BAO auditor as satisfying the audit requirement of an ARG/US Gold Plus rating. However, or the higher ranking Platinum rating, audits will continue to be conducted exclusively by ARG/US auditors. ARG/US has conducted more than 1,000 operational aviation safety audits since 1996 and its CHEQ system has provided transparent safety data to charter customers since 2001. ARG/US and IS-BAO are represented here at the Aviation Research Group/US exhibit (Booth No. 843).