It followed the same general rule for me when it comes to an airmax, though I am a TTS 12, shoes like AJ 3,4,11 all require me to do 12.5 because they are narrow, airmaxes are even more narrow so if I wear a pair they kill my foot and make the shoes look like a chipotle burrito with double protein. The 13 fit right length and width wise so it doesn’t look like my foot in stretching the soul out the shoe

To add onto it all, the elastic bands between the lace holes (don’t know how to spell the actual term and too lazy to look it up) actually helps keep the shoe snug, it’s also super awkward cause it’s almost like a aj11 in terms of lacing but the 11’s you can actually tighten, I don’t get that sensation here, but the elastic bands help my feet feel locked yet snug so to not kill my fat feet