Didn't I read somewhere that at himmelsbachs's retirement party the airline captain talked to Ralph himmelsbach about the flight path and if not mistaken he told Ralph they were flying either east or west of the vector or I 5 cannot remember but it was different than was always believed
In all probability, the airliner left Victor-23 about the Malay Intersection (which is near Toledo) and flew direct to the area of the Canby Intersection south of Portland where it rejoined V-23. This means that the airliner deliberately bypassed Portland on the west side and would have passed about 1000 feet west of Tina Bar at the time Cooper is believed to have jumped. During the flight between the Malay and Canby Intersections, the airliner would have been receiving radar vectors to fly from the air traffic controller.
The above has been discussed at extreme lengths (at least to the point of extreme exhaustion!) on other threads on this site and on the DropZone site before that. If you are interested in pursuing the matter further, I suggest you read some of those threads since they give reasons and go into greater details about the flight path.