Inc. a subsidiary of Morgan Stanley Capital Group Inc. The operation, a fleet of four International Flag Aframax tankers and two U.S. Flag workboats, provides crude oil lightering services to refiners, oil companies and trading companies primarily in the U.S. Gulf. contracts. tankers. entering into definitive documentation. significant Aframax cargo and logistical system in the Atlantic basin. In addition, it provides opportunities to serve U.S. customers with lightering service using OSG's Panamax tankers. since beginning operations in November 2002. Houston. and Head of OSG's Crude Tanker unit.