UPS902 began it decent from 39000 feet at the coordinates 33.22, -119.14, a straight line distance of 65 miles to LAX (just as a point of reference).
Its decent profile from that point took it on a course over Catalina VOR, continued ESE to a turn to the NNW approximately 7 miles NNW of Escondido. This gave it a glide path of approximately 195 miles from 33.22, -119.14 to landing at KONT.
Simple trigonometry will reveal that this yields a glide slope of approximately 2.19 degrees (200 feet of drop per mile), well within a standard profile approach for a heavy jet.
This is the major problem with Flight 902, beside the fact that it is coming in high and fast. Its speed, position and time with relation to the observation of the Helicopter Pilot. What appears at ContrailScience is immaterial to that.
Was over Catalina Island at 17:31:33 on November 8th (FlightMonitor Bob Hope). We will assume travel speed prior to this was 500 mph. Low side. Was still at 30,000 feet. Helicopter pilot said he noticed the Contrail/Plume at 17:15. So, that puts the flight approximately 64 miles west-southwest of San Nicolas Island (8.3 miles/minute) at the time of first observation. The pilot said at 5:15 pm it appeared to be 35 miles southwest of Los Angeles. Cannot be Flight 902. At that time it was 132 miles west-southwest of Catalina when the pilot first noticed the contrail/plume. Is it your contention that the pilot not only mistook 132 miles for 35 miles, but he also lost visual contact with the plane after it stopped making a contrail ? That is getting to the realm of fantasy, since the pilot has over 10 years experience. And was using a professional zoom camera setup.
All Contrail Science has done is find the closet plane to the event, which was not difficult since there are really only two possibilities. And their photos are junk, unless of course you think they could pick up a jet at 30,000 feet more then 35 miles away, as their photos supposedly demonstrate. No one else has produced any image with a plane/object that big. Not even going to get into how they could capture an image at 500 mph in low light without blur.