Definitely do this. If you get there about 25 minutes before show time and stand in front of the preshow area (to the right of the entrance to the theatre - it's outside of the theatre), your child can be right up front. Also, the trainer will be happy to answer any questions about the owl after the preshow should your child have any.
Additionally, after the Flights of Wonder show (you can take your time with the preshow, there will be plenty of seats available after you spend time with the owl), you can go up and talk to those trainers and see those birds and also ask questions about any other kinds of birds.
If you have a child who likes birds of any kind and haven't seen this show, you really need to invest some time to do this.