departed vs. launched

English as a Second Language English Vocabulary, Grammar and Idioms
1

The plane took off at six o’clock.

(1) departed
(2) launched

Which word can be synonym to the underlined one?

    Thanks..
2

Which do you think?

3

The plane departed at six o’clock.

4

Thanks for your opinion, but I was asking Foreigner!

5 
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?

6

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\ …