Matthew Poole and continuators on Ezekiel 1:9

9 Their wings were joyned one to another, they turned not when they went, they went every one straight forward.

The wings of the living Creatures, when stretcht out to fly, were joyned together, so the wings of those two Cherubims which went foremost, and the wings of the two hindermost were joyned together when they moved. It seems to refer to that Exod. 25.20. It signifies however the equal and uniform readiness of Angels, their concord, and union with constancy to do the Will of God, and it shews us the exact harmony that is between the works of God. These wings and their being joyned is exprest, Heb. by the union of loving Sisters with each other.

They lost no time in a difficult or tedious turning as we see in other Chariots, for which way soever they were to go thither they had Faces, directed, and so readily moved forward on their way whether East or West, North, or South, and held on till they had finisht their course, but then were ready for further action, and returned as quick to their station, where they might receive new Commands as Lightning does, so this and that verse 14. there they did return, here they did not, are reconciled.

This explains the former and confirms it to us assuring us that every one of those living Creatures are ready, faithful, and unwearied in doing the pleasure of their Creator, in his Government of the World. Vid. v. 12.