Pretty much every placeable is an even number of tiles wide (excluding the placeables which are 1 block square), except for the boarding desk. There is no way to place the boarding desk without it looking off as it’s always one block too much to either side. I’d like to ask the devs to implement boarding desks which are either 4 or 6 blocks wide, making it more visualy appealing.
Perhaps make two tiers of boarding desks: small and large. The small one being the same as now (but 4 blocks wide) and the large one having three lanes, allowing for more passenger to board the plane simultaneously. (being 6 blocks wide)