Cowl flew during White Knight in the Deeps I believe.
I was thinking Cowl was a time traveling Lord Raith, Kumori=Maggie Sr. or something like that at the time, but that is more complicated than necessary. We know that Cowl has extensive cuts on his arms, etc which doesn't really fit with a White Court vampire who we know can heal.
But, there is a parallel with how Justine anticipates Thomas then 'glides' over to Thomas, and Kumori and Cowl. That said, I'm sure the white court doesn't have a monopoly on said anticipation, mental commands, and silent walking over to master, etc. Nor is there a faction that has a monopoly on flight.