I've heard and used the term "air draft" my whole life. If it's not correct, then it's at least in common use. To me, the term "vertical clearance" means how much is available, as on the chart or on the bridge itself. Air draft is how much you need. > Date: Sun, 22 Sep 2019 17:35:55 -0400 > From: Rudy Sechez<rudysechez@gmail.com> > > I'm seeing "air draft" being used quite often now-a-days. I'm used to using > "vertical clearance". I know what it means, but has "air draft" become > "proper" terminology now, or is it just a term introduced and used by those > not in the know?