It seems unlikely that a plane would just go missing. It has now been over a week so it seems unlikely many if there are any passengers are alive. Especially with the technology we have to track. Apparently, there were two passengers on the plane with passports with were stolen although they seemed to be cleared of having anything to do with the missing flight. I have heard some theories from different people about how it was hijacked and flown somewhere else which is what my dad thinks.
What Became of Malaysia Airline Flight 370?