This is a very delicate combination and should only be executed by a CoC war strategist and expert! Here is why: Defence buildings consist of ground and air or both. Now imagine two scenarios, when you bring ground troops only, the air defense is useless and vice versa.
So on that note, clearly it is not wise to bring a combination of both into WAR or when looting! However, there are special circumstances where an opponent has clearly placed ground units on the outer layer of the base and out of the air defence reach.
This allows you to use your air troops to make way for your ground troops. Be warned however these kind of bases are quite rare.
Do you feel otherwise? Please share your thoughts.