Maersk Tankers, a unit of A.P. Moller-Maersk, said on Thursday it had quit four unprofitable crude oil charter contracts by buying out supertankers and selling them onwards, continuing its exit from crude oil transportation. The company now has charters for just two supertankers, called Very Large Crude Carriers (VLCCs), although the intention is to get out of these contracts too, Maersk Tankers spokeswoman Stine Pedersen said. Buying the vessels from their owners allows Maersk to exit the charter contracts.