Ok... when it started raining with them in the whale i expected some stupid shit but this wasn't it.
As much as i agree with the modern looking airport being surprising in reality it goes with the story, when they were chasing that water snake/dragon thing some chapters ago they had to go underground and bumped in the water distribution system of the village and it was pretty advanced, made by the dwarves and Hajime arm isnt exactly low tec either.
At least the air vehicle are pretty fantasy like and creative.
For those that would like to read a otherworld story there is a french comic called Ekho, all the vehicles and other mechanical technologies are powered by beasts, the story is more engaging than what you would give credit by the first chapter and the art is "chef kiss" sublime, made by the artist of W.I.T.C.H.
Here a link for a site were you can rad it https://readcomiconline.to/Comic/Ekho