With regards to second interviews, yes it is possible as a friend of mine had two interviews within the space of one year. Unfortunately the second one was offered at just 24 hours notice hence very little time for preparation, sadly it was a no go for him.
City or Jet, yeah there are guys heading off to the desert all the time, also read on REPA that some guys now are simply resigning. I think there will be openings for new cadets for a bit yet, despite expansion stopping this year.
Best of luck everyone.