From what I understand Tiger were trying to fly RPT on a Charter AOC. Why? If they have an Australian RPT AOC why can't they get an Indo one, and why mess around with pseudo Charter/RPT?
Because the Tiger AOC does not have 737 on it. They didn't have the A320 capacity to put the Airbus into Bali, not to mention it couldn't do Melbourne, only Adelaide and Perth. Getting more A320s for Bali was pointless as it was going to be phased out hence the quick grab on those three Virgin 737s.