Question: Which Malaysia Airlines disappeared in 2014 that required an autonomous underwater vehicle Bluefin-21 to help look for it?
Sentence (from "Malaysia Airlines Flight 370"): Malaysia Airlines Flight 370 (MH370/MAS370), registered as 9M-MRO, was a scheduled international passenger flight that disappeared on 8 March 2014 while flying from Kuala Lumpur International Airport, Malaysia, to its destination, Beijing Capital International Airport in China.
Relevant evidence: Yes