Izzie did *WONDERFUL* on the flight!! She was Miss Popularity, while walking through the security line.
The flight attendents were amazing, bringing ice & water to give to Izzie on the flight. She couldn't be out of her bag, but they did let me hold her (in her carrier) on my lap during the whole flight (except takeoff & landing.)
I highly recommend flying on Midwest airlines if you can (plus they give you freshly-baked chocolate chip cookies!)
Thanks for EVERYONE's help!