The tail should not touch the bottom of the cage, nor should its head hit the cage top. We prefer to let our babies learn to fly naturally during the weaning process. Once they go into their new pet homes however it is wise to have their wings clipped. This avoids possible injuries and unintentional free flights. Even birds that have their wings clipped should not be taken outside without being placed in a shipping kennel.
Macaws can still have a limited amount of flight due to their large wing web area.
Make sure you check your clipped wings on a regular basis to guard against surprise flights. In warm weather leaving doors and windows open for ventilation can mean an unintentional escape of your bird. To avoid this needless loss see your avian veterinarian for a wing and nail trim. If you are trimming their wings remember to avoid cutting any new feathers that have growing feather sheaths on them. These will bleed profusely if cut.