Originally Posted by
Sunvox
I didn't prepare until the day before and I got 3 offers in '96

If you fill'd the squares and you're an "honest Joe" I think you'll be fine with or without "prep", but just one dude's opinion.
The above is secretly part of the screening process. The objective is to see if you're dumb enough to take this advice!
I think Emerald Coast is probably the gold standard for most airline prep. I didn't know anything about Cage until after I interviewed but sounds like they are close to United. Heck do them both. ECC refunds you in you're unsuccessful. You have nothing to lose.
The interviewers don't expect or appreciate overly rehearsed answers but they do expect polished delivery.