Puppets War lets your models fly
Puppets War has new flying model bases available over in their webshop.
From the website:
Set contains three 60mm round bases and 3 plexi stics(50x15x8 mm) Parts are designed to fit 28mm “heroic” tabletop wargames scale, supplied unassembled and unpainted. Designed and sculpted by Puppetswar Art Team.