I can't imagine concentrating on a complicated project like that on the go, but I went back to stare in awe at said picture and I think its a train or bus. Still a flex.
Still looks like a plane to me, with rows of 2-3-2 seats.
There are definitely no buses that wide.
It seems a bus to me, just look at the size of the windows. Airplanes don't have windows like that..