Hi ACG2008 -
Nice to see you on My Swiss Alps. You've picked the best month to visit Switzerland, in my opinion.
I agree with Annikas comments and the perspective to spend more time in each of fewer places, unless you specifically are going to Switzerland to ride the trains. Factor in possible jet lag when you arrive; that might best be a light duty day.
Have you flown to Europe before?
Do you have specific interests- h iking, walking, museums, mountains, old towns, or ????
Don't fly within Switzerland. Use the trains. You'll see more and arrive in center city; no transfer in from the airport.
I'd certainly make the Jungfrau region a focus.
Here is a little light reading about Wengen and the Jungfrau region:
And, I'd go directly to Luzern upon arrival. You're only about an hour from Zürich airport ( Flughafen) , with two trains per hour. One (every hour at xx18) requires a change at Zürich main station, the other at xx47 every hour has no change of trains.
I like Zürich better than any other city in Switzerland, but not for reasons that appeal to a first time, quick look tourist. The museums deserve lots of time, for example. Luzern has a more spectacular setting and a greater variety of tourist activities. And, in contrast to Zürich, you've got some high mountains nearby.
So, I'd head right to Luzern, spend some time there, and then go to the Jungfrau region and stay there (with day trips if desired) until a return to Zürich Airport. What time of day is your flight home?