No problem. Sturdi's carriers are also really good. I took them to the bathroom to use the litter box. I'm sure you could place it on the floor though if they give you a row to yourself.
Thanks. I checked Sturdi's carriers. It's a little bit over my budget, but looks nice for an in-cabin flight. I see you can bring cats to restroom with a litter box. Now I can imagine better how an in-cabin flight is like. My worries are faded. Thank you so much!