One thing that has not been mentioned in any of the posts thus far, and it is my number one reason for using epoxies in high stress areas -

CA is a fantastic adhesive in the right place. Its major drawback is (for me anyhoos) is that seems to go brittle very quickly in strong sunlight and heat. I am not talking minutes here, but certainly a matter of months.

Epoxy does yellow in uv exposure, but it seems (opinion and observation warning) that it loses less strength than does the ca.

So, if I were looking at a joint that is exposed to light, and heat, then I would prefer to use an epoxy. Does that answer the question on the wing join?