Russian-Made Missile Destroyed Flight MH17

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chairman - n. a person who is in charge of a company or organization

cruising altitude – n. the height in the sky at which an airplane stays for most of a flight

transparent – adj. honest and open: not secretive

on board – prepositional phrase in or on a train, boat, plane etc.

assign – v. to say that someone has (something, such as blame or responsibility)