S.H.
My son will be 3 in August, and he sits to pee. It's easier at home and in public. Until very recently, he was also stripping completely from the waist down, which meant that we had to take his shoes off in public bathrooms. (Yes, it's a huge pain.) I've continued to work with him, and he can finally pee on a public toilet sitting down with his pants at his ankles.
As for you, if holding him up like an airplane works for now, just do it. I promise you won't be doing that forever. Eventually, he will be tall enough to either stand on his own or sit comfortably on the toilet. :-)
This phase will pass before you know it.