B727 CAPT FOR A SUPPLEMENTAL ACR COMPLAINS THAT THE COMPANY ASSIGNED HIM TO REPOS THE ACFT AFTER AN 18 HR DUTY PERIOD AND 9 HRS OF FLYING.

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AFTER AN 18 HR DUTY DAY (FAR PART 121 SUPPLEMENTAL) AND 9 ACTUAL HRS OF FLYING; WE WERE TOLD THAT WE MUST FERRY THE ACFT UNDER FAR PART 91. THIS IS COMMON PRACTICE IN THE 'SUPPLEMENTAL' AIRLINE BUSINESS. I DO NOT AGREE WITH THIS PRACTICE; BUT IT IS COMMONPLACE IN THE CHARTER BUSINESS. AFTER MANY DUTY HRS AND FLT HRS A PLT SHOULD NOT BE PRESSURED INTO FERRYING A PAX JET UNDER FAR PART 91 RULES. THIS SHOULD BE ADDRESSED IN THE INTEREST OF SAFETY. LONG HRS ARE LONG HRS; PART 121 OR PART 91. WE WERE CLRED TO CROSS KNUCK INTXN AT 10000 FT; 250 KTS. I READ BACK THE CLRNC. COPLT WAS FLYING. LEAVING 11000 FT; APCH CTLR ASKED OUR SPD. I REPLIED '250 KTS.' HE THEN ASKED OUR ALT. I REPLIED 'LEAVING 10500 FT FOR 10000 FT.' HE STATED THAT WE WERE 'CLRED TO 11000 FT;' BUT TO 'MAINTAIN 10000 FT.' NO CONFLICTS OCCURRED AND WE PROCEEDED TO DULLES ARPT AND LANDED WITHOUT INCIDENT. ALTHOUGH THE PIC HAS THE FINAL AUTH ON WHEN TO STOP FLYING; THERE IS AN INCREDIBLE AMOUNT OF PRESSURE PUT ON CREWS TO FERRY ACFT AFTER LONG DUTY AND FLYING DAYS.