A DO-328 JET FLT CREW FLEW A FERRY FLT USING A COMPANY CALL SIGN ON AN ACFT THAT WAS NOT ON THE ACR'S OPERATING CERTIFICATE.

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I AM WRITING THIS RPT IN REGARDS TO A FLT ON WHICH I WAS ASSIGNED AS A CREW MEMBER BY MY COMPANY. THE FLT WAS A PART 91 FERRY FLT. I ARRIVED AT THE COMPANY HANGAR TO FIND THE FO PREFLTING THE ACFT. HE HAD BEEN DROPPED OFF AT THE ACFT BY THE DIRECTOR OF DISPATCH AND HAD OUR PAPERWORK FOR THE FLT. I REVIEWED THE PAPERWORK AND FOUND EVERYTHING TO BE IN ORDER. THIS INCLUDED THE ACFT LOGBOOK; WITH THE APPROPRIATE MAINT FERRY FLT ENDORSEMENT; AND THE FAA ISSUED FERRY PERMIT FOR THE ACFT. ALL REQUIRED PAPERWORK WAS ON THE ACFT. THE FO INFORMED ME THAT DISPATCH HAD FILED OUR IFR FLT PLAN AND ASSIGNED US THE COMPANY FLT NUMBER. WE CONDUCTED THE FLT UNDER THE CONDITIONS STIPULATED BY THE FERRY PERMIT: MINIMUM REQUIRED FLT CREW (CAPT AND FO); NO PAX/CARGO; AND WE HAD BEEN APPROVED FOR IMC FLT. THE FOLLOWING DAY; I WAS TOLD THAT THE FAA WAS MAKING AN INQUIRY INTO THE FERRY FLT. I WAS TOLD THE ACFT I FLEW WAS NOT ON THE ACR CERTIFICATE AND SHOULD NOT HAVE BEEN FLOWN UNDER A COMPANY CALL SIGN. I HAVE NO KNOWLEDGE OF THIS. I CONDUCTED THE FLT IN ACCORDANCE WITH THE FAR'S; OPS MANUAL; AND THE FAA FERRY PERMIT AS DIRECTED BY MY COMPANY DISPATCH OFFICE.