I'm flying with three dogs from Mexico City to Germany via Lufthansa in a few months. I'm eyeing the Impact Collapsible crates but in the reviews of the product, I saw that one person got denied from boarding a United Airlines flight because the crate was collapsible. However, this was a comment from 4 years ago, and since then I've seen multiple reviews stating success in flying with their dogs.

I can't shake this idea of potentially being denied, however the crate does meet all of Lufthansa's requirements so long as the IATA kit is equipped. Has anyone flown Lufthansa with this crate?