Making unit type flyer

[winter twilight]

I am making a spell which unit raise up when casting and need to make the unit fly to give it fly hight is it possble to do it with trigger and how or I have look for another way like replacing unit tx for you time

 

[Chaosium]

Adding the crow form ability should do the trick

 

[Nudl9]

Crow Form allows you to change flying height simply by adding the ability.
If you want to make a unit turn into a flying unit, you should base it on talons flying ability.
Adding "flying" through classification doesn't work.