Santa visited Australian homes last night. Air traffic controllers reported that his flight was smooth, and uneventful.
Santa left Australian airspace just after midnight West Australian time, heading for Papua New Guinea.
Santa has now received the last letters from children, and all presents have been loaded on the sleigh.
Controllers have confirmed his flight plan, and told Santa of any last minute changes to his safety procedures.
Santa will use a flextrack this year to fly faster. Controllers in Airservices' air traffic control complex in Melbourne have checked the weather forecast to make sure Santa gets a clear run.
Santa is due to arrive in Australian airspace late on Christmas Eve.
Santa wants the exact time to be kept secret so that children are not tempted to stay awake to see him. Santa has asked us to remind children that he does not visit houses where children stay awake.
Controllers are now ready for the big flight.
Most pilots should be fast asleep when Santa comes to deliver his presents.
But some pilots will have to be flying – like passenger jets, air ambulances or fire fighting helicopters.
Air traffic controllers will make sure these aircraft stay away from Santa's sleigh.
Other planes have been warned not to try to chase Santa.
Nothing flies as fast as a special sleigh pulled by nine magic reindeer led by Rudolph with his big red nose.
Do you know the names of all the reindeer? (Look below for the answers)
Santa Claus and the elves use magical reindeer dust to make them fly. This dust is sprinkled over the reindeer before they leave on Christmas Eve. It gives them powers to fly right around the world.
(Reindeer names: Rudolph, Dasher, Dancer, Prancer, Vixen, Donder [sometimes called Donner], Blitzen, Cupid and Comet)
Santa and his elves are resting today, to get ready for their big night on Christmas Eve.
The reindeer are fit and healthy and most of the presents have been loaded onto the sleigh.
Santa's technicians are doing last safety checks on the sleigh, to make sure everything is ready for Christmas Eve.
Loading has started. Reports are coming in that Santa's elves have started loading the sleigh for the delivery flight in four days time.
The Australian Satellite Imagery Organisation (ASIO) shows us a steady stream of elves loading presents into the sleigh and it we can confirm that this year's cargo will be a record.
Airservices air traffic controllers, flight information people, technicians, engineers and many other staff are working to make things easy for Santa and make sure he has constant radio contact and gets the right signals from the hundreds of navigation and communication aids across Australia.
If you look closely at the satellite pictures from the North Pole you will see elves driving forklifts, presents being delivered and loaded onboard Santa's sleigh.
Santa has allowed us to show the view from inside the sleigh. We weren't allowed to take a real photo, but Santa gave us this picture instead. The display has a satellite navigation system in the middle to make sure Santa won't get lost on his way from the North Pole.
Santa has covered up the list of houses that he will visit on Christmas Eve.
The sleigh also has a special landing system to make sure he can land on rooftops quietly and safely.
We've also shown some detail of the flight plan. Santa plans his flight very carefully, and this display lets you see what Santa’s computer system will show during his flight.
Santa's elves worked flat out overnight to develop a slightly harder version of his Santa Flight Simulator. The game is available now.
Santa Claus has also now lodged his final flight plan. This will allow air traffic controllers to make sure aircraft are kept out of his way on Christmas Eve.
Santa has allowed Airservices to show an outline of his flight path.
But Santa has insisted that children must not know exactly when he will be in their area.
Santa won't visit houses where children stay awake trying to see him.
Santa's sleigh is cleared to travel down the international date line, and move through the Pacific Islands and New Zealand before entering Australian airspace.
Santa's sleigh carries a special ADS-B transponder to ensure it will be visible to Australian air traffic controllers.
The controllers will be able to see the sleigh, but other aircraft will not.
Controllers will direct aircraft away from the actual flight path on the night.
Santa will be given priority clearance.
Santa has been testing the sleigh around the North Pole, to make sure all the safety equipment works, and the reindeer are fit and healthy.
Santa has allowed us to show a recording of one of his test flights. The radar screen shows that Santa flies very fast.
Santa also uses a special software game to practice flying the sleigh in the lead-up to Christmas. He has given very special permission for Australian children to use a modified version of the game, which has been designed for 4-8 year olds.
Santa has asked the elves to develop a more difficult version of the games, and hopes to release it later this week.
Christmas Eve is just one week away, and Santa is busy getting ready to deliver presents around the world.
Santa has to fly very fast and very low to make sure he delivers all his presents to children on time in just one night.
He needs help to make sure he stays away from planes, hills, tall buildings, power lines and radio antennas.
Santa will always get top priority in Australian airspace. Air traffic controllers will help keep all other aircraft away from Santa, so he can get through his tight schedule and make sure he gets all his deliveries done in time.
Santa recently introduced a new sleigh, to help carry even more presents.
He visited Airservices Australia's Sydney Airport Fire Station and Control Tower. The firemen checked the sleigh to make sure it is safe, and Santa talked with the air traffic controllers about his flight plan.
Santa agreed to release these photos, so that children could see that he takes safety very seriously.
Santa has also allowed us to show the details of his new sleigh. Click on the sleigh to explore the safety features.
The website will be updated regularly over the next seven days to show more information on Santa's preparations for Christmas.
Check back here each day to see Santa's progress.
Air traffic control in Australia, and around the world, is helping Santa prepare his sleigh. Santa has promised to give Australian children a sneak preview of his preparations.
From Monday 17 December, Santa has promised to give us permission to show what he's doing each day leading up to Christmas. Come back and visit this website regularly. While we wait for Santa's permission, here's some photos of what he did last year.