ROSIE is an intersection. What they are probably doing is flying up to a Restricted Area and doing test work. During the test work I would imagine they cancel IFR so they can do their work and then when finished pick up an IFR clearance back to LAX. Since they are already airborne the origin will be the nearest fix that they will enter radar contact at.
BMI727 From United States of America, joined Feb 2009, 16088 posts, RR: 27
Reply 2, posted (6 years 1 month 2 weeks 6 days 15 hours ago) and read 3174 times:
It is a testbed for Raytheon. I think it is used to test radars and sensors. Looking at the map, it appears that the plane went up into the Palmdale/Edwards testing area to do some work before returning to LAX.
Boeing has turned the prototype 757 (which I saw at BFI last summer) into a similar aircraft that has all of the F-22's electronics and sensors in it. Having a plane like this allows the company to test, monitor, and modify the avionics and radars more easily than having them installed on a smaller fighter.
Why do Aerospace Engineering students have to turn things in on time?