Original Message

"No one said you can't fly part 91 Without the crew, but you are still under the part 135 duty period you reported for and have yet to be properly released from and therefore must comply with duty period rules under 135" False! There is no 135 duty period . You are on duty or you aren't, regardless of the FAR you are using. There is absolutely no restrictions for duty under FAR 135.267(d). The are REST requirements; not DUTY requirements! So, yes you are on DUTY still if you fly Part 91, but without rest requirements. You are not required to show 10nhours of REST in the preceeding 24 hrs at the completion of the assignment under Part 91. And yes, you are still a commercial pilot flying for compensation under Part 91.