The way it is portrayed in the FBI files is as follows:
Trip 1) Get the money. After which the passengers were released.
Trips 2, 3 & 4) Get the four parachutes.
Trip 5) Get the plates and meals...perhaps radio too?
The most important part of this process relates to the money and specifically what the passengers told Bruce about its delivery.
Also, the passenger manifest--on NWO letterhead shown in Part 2 of the Harrison files on Shutter's site--is apparently incorrect according to Bruce in that it lists three people with the last name McPhearson. According to Scott McPhearson, in an interview with Bruce, the FBI made a mistake listing three McPhearson's and that "S. McPhearson" and "Scott McPhearson" are the same person listed twice. This would mean that 305 carried 36 passengers including DBC, not 37 as shown on the NWO letterhead manifest.
With all of this in mind, I have to ask: If they can't even get the damn passenger manifest right, why the fuck are they viewed as infallible when it comes to something as big and complicated as the flight path?
Oh, let us also not forget the Palmer Report fiasco which was a colossal fuck up in that Palmer identified the 1970 dredge on Tena Bar as the 1974 dredge on Tena Bar which of course had major implications with respect to the timing of the money arriving at Tena Bar.
It's important to note these errors and consider that there may be many more--i.e., FBI Flight Path.
Cheers!