travel bag

I’m looking for recommendations for a bike bag for airline travel with a Rail 9 (large). Bike weight without battery is 21kg, so I’ve got ~10kg for a bag, padding, etc for a 32 kg max. I’m hiring a battery and will take the battery end caps and cover. I’m keen to hear recommendations and tips.

I have a 2018 Specialized Turbo Levo Carbon Comp large. I want to start traveling with my bike this June, and have been casually searching for some type of hard case. I searched the forums and it looks like there is not even one post that I can find on the subject. I live in the US so though...