I tend to agree with Chris here. I realize the thread is a couple of months old now, but my wife recently got a Macbook Air and I wondered how Fedora might do.
My own experience, though not thoroughly tested, is that generally, RH based distros do better using livecd-iso-to-disk (and it doesn't have to be a live CD--it works quite well with install CDs or DVDs, netinstall media, generally, anything intended to boot an RH based distribution), and unetbootin works better with Debian (including Ubuntu) based.
Anyway, using livecd-to-usb and the live F17 x86_64 LXDE live CD, I created the usb with livecd-iso-to-disk, specifying
--format --efi (I am not 100 percent sure that's necessary).
Upon booting the Air, holding down the option key, I was giving the choice to boot into the EFI drive. It booted with little problem. Once booted, the touchpad was a bit flakey, reversing left and right, but I was basically just curious to see how it would run. Aside from that, it was a pretty straightforward live boot. I'll have to try again without the --format --efi option and see how that goes---the one time I tried it with something else, it showed the USB as Windows (as opposed to EFI) and wouldn't boot. I also installed that one with unetbootin.
---------- Post added at 10:15 PM ---------- Previous post was at 09:10 PM ----------
To add a bit more, in case someone does this--if one uses the --format --efi option, then before reusing the USB stick, you will probably want to reformat it. Otherwise, fdisk will complain that it's an EFI partition, fdisk can't handle it, please use parted.
So, I just used parted and typed remove 1 to remove the partition. I then typed mklabel msdos which more or less clears the USB stick.
After that I could use fdisk as usual.
Out of curiosity, I did try the same live LXDE F17 Beta CD with Unetbootin and livecd-iso-to-disk without the --format --efi options. In both cases, the Macbook saw a drive which it labled Windows, but wouldn't boot.
Your mileage may vary of course, that was as far as I took this.