departed vs. launched

The plane took off at six o’clock.

(1) departed
(2) launched

Which word can be synonym to the underlined one?


Which do you think?

The plane departed at six o’clock.

Thanks for your opinion, but I was asking Foreigner!

When I looked the word [i]launch[/i] up in the dictionary, it is used mainly

with ships, rockets and satellites. I have not seen this word used with planes.
In fact, can the verb launch be used with planes?

I believe you should look at it at a different angle: ‘launch’ is a transitive verb ie you can only launch smth (a satellite\plane\ship\project,.), whereas a plane\bus\ train can depart\ …