I twigged to that immediately, also. Canonically according to the Internet the Arwing is supposed to be 28 “sm” long in its SNES incarnation and 18.5 of them thereafter, only raising the question of what the hell the “sm” is as a unit and how that translates to real world ones. But assuming that Fox and his furry pals are roughly the same proportions as humans, the way the Arwing is consistently depicted is with a single seater cockpit that one of them fits in to handily, roughly analogous to a real world fighter jet. Thus we an assume they’re about the same proportions. So, like 18 to 20 meters long, which makes Star Fox’s units (maybe they’re “space meters”) seem pretty comparable.

I think the Arwing’s on the wrong page, here.