Yeh right... Boeing was not at fault and you can guarantee they have been heavily consulted, behind closed doors (without Perth's flogga G.T.!) right from the very moment it "went off the screen" and a number of Gulstreams darted out of Diego Garcia & Guam into KL!
Let's keep to the know facts - the aircraft was deftly manoeuvred along the borders of Malay; Thai and Indo airspace right to a point above Bandah Aceh, both in altitude and headings. There were over a dozen "suitable" and capable airfields he flew past, he could have used, if they wanted to.
I personally thought he took the northern arc of "engine pings" to sneak up into the back of China with his "Cargo" but who knows?
What was on the Cargo manifest needs to be examined. Lips have been sealed over this part haven't they!
Herein lies the motivation for such a stunt, I contend.