Not too keen on
What's meaning?
I'm not too keen on flying because you spend too long at airport

Question

Answer

It means something you dislike or something that’s not to your liking.

I’m not keen on peeling onions as they make my eyes water.
I don’t like peeling  onions because they make my eyes water.

Answer

Not too keen on = not very interested in

Answer

It means that someone doesn’t enjoy (doing) something or isn’t fond of (doing) something.

Answer

The expression, "not too keen on" (which is mainly British English) means that the speaker doesn't particularly like / enjoy something (in this case flying).

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