But the upgrade went without a hitch.

The biggest task for the IT department was getting all of the data out of the old system and into the new.

Because Jetstar has had many millions of passengers since it started operations, and it still has all of the booking information in its reservation systems, that information needed to be copied over.

"Now, for the first person who ever bought a seat with us in 2004, their booking hasn't changed for some time, so that is easy. But many people change bookings or purchase additional pieces that go with their bookings. So the data that relates to those bookings is constantly changing. So at the end of January we took a bulk copy of everything that was in the underlying database and loaded it in to our New Skies database and for every day since then we have been taking a copy of the new and changed bookings on that day and loading it in [to New Skies] so we gradually try and catch up to the production environment."

Then on Friday Jetstar's IT department took the reservation system down at 9.30pm. The first task was to copy all the new and changed bookings from Friday into the new system so that it had all the up to date information there. That process too a number of hours.