MLG FO NOTIFIED A WK AFTER THE EVENT BY COMPANY PERSONNEL THAT NON REVENUE AND REVENUE PAX ON BOARD A 'LAST FLT' OF A RETIRING CAPT THAT HAD UNAUTH ACCESS TO THE COCKPIT.

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DURING COMPANY (ACR) SPONSORED FLT CONDUCTED UNDER FAR 91; PAX WERE ALLOWED TO ACCESS FLT DECK FOR PHOTO OPPORTUNITIES; INCLUDING SOME PAX SITTING IN CAPT'S SEAT FOR PHOTOS. THIS WAS A COMPANY FAREWELL FLT FOR THE RETIREMENT OF AN MLG CAPT. I SERVED AS FO; AND AM QUALIFIED AS CAPT/CHK AIRMAN IN THE MLG. 5 DAYS AFTER THE FAREWELL FLT; I WAS INFORMED OF A COMPANY INVESTIGATION OF THE POSSIBILITY OF 2 REVENUE PAX BEING ONBOARD FOR THE LAST 3 LEGS. THE CREW DID NOT KNOW UNTIL 5 DAYS AFTER THE EVENT. THE PAX (NON-REVENUE) WERE ALLOWED TO TAKE PHOTOS WHILE THE RETIRING CAPT WAS IN THE CABIN SHAKING HANDS AND SAYING GOOD-BYE. IN THE FUTURE; ALL FAR 91 FLTS; OPERATED BY 121 ACR'S SHOULD BE REQUIRED TO MEET 121 REQUIREMENTS FOR HANDLING OF PAX. SECONDLY; 1 PAX; A PERSONAL FRIEND OF THE RETIRING CAPT; WAS ALLOWED TO FLY THE ACFT FOR ABOUT 5-10 MINS. IT NOW APPEARS THAT; WHILE HIGHLY QUALIFIED WITH OTHER ACFT (FORMER WWII PLT); HIS MANIPULATION OF THE CTLS MAY NOT HAVE BEEN IN COMPLIANCE WITH FAR 61. RECOMMEND A REVIEW FOR ALL PIC'S OF LARGE ACFT TO REVIEW REQUIREMENTS AS LISTED UNDER FAR 61. RECOMMEND THE ACR'S BE ADVISED TO NOT ALLOW ANYONE; AT ANYTIME; TO ENTER FLT DECK DURING FAR 91 FLTS.