Zal and Zara and the Champions Race by Kit Downers.

Zal and Zara are back for another fast-paced magical adventure. After winning the Great Annual Carpet Race, the indomitable Zal Thesa and Zara Aura are back to race again. But as they prepare for the ultimate flying race, they discover a plot to sabotage the competition. As their old foes in the Shadow Society seek revenge, Zal and Zara must work together in order to overcome a series of magical obstacles if they want to save the race – and win it.