The term 747, SAY is a reference to the Boeing 747, a wide-body commercial airliner. The crossword solution for this term is JET, a three letter word. The Boeing 747 is a large aircraft that is commonly referred to as a jumbo JET or simply a JET. It is one of the most recognizable aircraft in the world and has been in service since 1969. It is used for both passenger and cargo flights and is capable of carrying up to 660 passengers.