The world did not see 911 coming...
The world did not see MH 370 coming...
Consider this... a 'perfect' terror plot?
Pick an airline, coerce or infiltrate of one of the Flight Deck into making a 350 tonne aircraft 'vanish'...(up to 450, depressurise, turn off systems, HDG SEL into the vast open spaces... or whatever other theories we may all simply continue to hypothesise about...)
Wait for some time... then repeat the event and another airliner vanishes... and perhaps one more...
The aviation world and business would collapse... what a coup.
I really do believe it is an absolute imperative to fit completely independent GPS tracking systems to all airliners. NOW...