767 Minimum Crew
The crewing of any aircraft depends on CAA/JAA/TC/FAA of 1 flight attendant for every 50 seats. 49 seats = 1 flight attendant, 51 seats=2 flight attendants. However, into this mix comes individual company policy. Your specific company may place 8 flight attendants on the plane regardless of the number of seats. But this is company policy. I recently worked a contract position on a 747SP. 94 seats, no seats in the upper deck. FAA required a minimum of 4 flight attendants on this specific aircraft due to the size. It was a special addendum to their FAA regulations. The had us alternate with flight attendants at L1, R2, L3, R4. No flight attendant for the upper deck as this was not to be occupied for take off or landing.