[dalore]

tok long yu trupela

I want to know how/where the word for plane came from? balus

But also remember the tok pisin is a recent language, created from the colonisation efforts so it's not strange to find that modern words will have a translatation. Helicopters and piano's were around at the time.

[ithkuil]

it's possible the word comes from some substrate language, possibly the name of some flying animal.

The thing with pidgins is that when they start out, they are everybody's foreign language and are used as lingua franca. Generally people have their own native language where they may or may not have words for a given concept but then when they talk with other people from another language group they may or may not be able to just sneak in such a word and be understood. That's why sometimes long turn of phrases are used to describe stuff; not because the speaker doesn't have a word but because the speaker and the listener don't have a common word.