The Shield Archon's speed is listed as being:
Speed 40 ft., fly 90 ft. (good); 30 ft., fly 60 ft. in armor
This is incredibly pedantic but there is no fly maneuverability listed for the "with armor" stats. I assume it's also "good" but every other creature in all other bestiaries, (angel, demodand, kami, oni, etc) all list fly maneuverability in armor even if they're the same.