FLC OF AN ACR TRANSPORT JET DID NOT HAVE SUFFICIENT REST PERIOD FOR THE FLT TIME FLOWN PRIOR TO NEXT ASSIGNED FLT. FLC DID NOT CONSIDER PART 91 FERRY FLT AS COUNTING TOWARD FLT TIME FOR REST PERIOD. COMPANY PERSONNEL USED THAT TIME AS COMMERCIAL FLYING TIME; AS THEY SHOULD; TO COMPUTE FLT TIME FOR REQUIRED REST PERIOD.

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WE WERE SCHEDULED AND FLEW A SUPPLEMENTAL FLT FOR THE MIL FROM GPT TO YUMA; AZ. I UNDERSTOOD THE RETURN FLT TO GPT TO BE EMPTY AND A FERRY FLT. TOTAL FLT TIME WAS 4 HRS 10 MINS TO YUMA AND 2 HRS 54 MINS BACK TO GPT. TOTAL OF 4 HRS 10 MINS SUPPLEMENTAL AND 2 HRS 54 MINS PART 91. AFTER A REST PERIOD OF 12 HRS 36 MINS; WE RETURNED TO THE ARPT TO FLY GPT TO PIE AND BACK. TOTAL FLT TIME WAS 2 HRS 45 MINS UNDER PART 121 SUPPLEMENTAL. I INTERPRETED THE PART 91 FLYING THE NIGHT BEFORE TO BE NOT INCLUDED IN THE TOTAL PART 121 SUPPLEMENTAL FLYING TIME WHICH DETERMINES REST REQUIREMENTS. THE COMPANY; HOWEVER; INCLUDED THE RETURN FERRY FLT THE NIGHT BEFORE IN THE TOTAL PART 121 FLYING WHICH MEANT A REST OF 7 HRS 4 MINS X 2 = 14 HRS 8 MINS WOULD BE REQUIRED AND THEY DETERMINED THAT WE WERE THEREFORE NOT LEGAL TO FLY GPT-PIE-GPT ON THE SATURDAY. SCHEDULING SHOULD HAVE PLANNED THIS TRIP WITH MORE EMPHASIS OF WHAT PART WE WERE OPERATING UNDER AND WHAT THE LEGAL REST WOULD BE AND I SHOULD HAVE ASKED THEM EARLIER.