Malaysian Airlines Flight 17 was a Boeing 777.
Malaysian Airlines Flight 370 was a Boeing 777.
Both aircraft have the Fly-By-Wire, a Raytheon anti-hijacking system. If hijacked, the craft lands itself. Both airliners have sophisticated communication systems with 16 constant data feeds, five satellite feeds.
Both airliners are gone, one shot down and one simply disappearing. No way did tracking systems not know exactly where 370 was when it went out of communication. No way do they not know what happened to it.
It all smells.