A flock of seagulls flies against the background of sunsetA flock of seagulls flies against the background of sunset
The bottle is flying against the background of grassThe bottle is flying against the background of grass
A white plane is flying in the sky above the cloudsA white plane is flying in the sky above the clouds
То же, что лететь (в 1 знач., но обозначает движение, совершающееся в разное время, в разных направлениях).