The first flights from Sydney and Melbourne have touched down in Adelaide after South Australia lifted COVID-19 border restrictions that have been in place for months.
There were emotional reunions at Adelaide Airport on Tuesday as passengers were greeted with hugs, tears and smiles by family and friends.
Premier Steven Marshall described the scenes as "wonderful".
"It's been a long wait, but the wait is finally over," he said.
For the first time in more than 150 days, people from Victoria, NSW and the ACT are allowed to enter SA along with those from WA, Queensland, Tasmania and the Northern Territory, although some restrictions and requirements will remain in place.
Everyone must be double-vaccinated and use a new online border entry process known as EntryCheck SA, which assesses an individual's vaccination status, departure location and COVID-19 risk.
Based on the information provided, travellers may also be prompted to use a new HealthCheck SA app, which will help them monitor daily symptoms and guide them through any testing and quarantine requirements.
Unvaccinated travellers will be required to seek a special exemption with applications to be assessed on a case-by-case basis.
So far about 30,000 people had applied to come to SA in the days and weeks to come.
Most of the earlier arrivals are expected to be returning residents or people reuniting with relatives and friends.
Tourists are more likely to travel to SA over the Christmas-New Year holiday period.
Mr Marshall said the state's border restrictions were in place for good reason after serious coronavirus outbreaks across NSW and Victoria.
But he said it was now time to allow people to be reunited with their loved ones and for others to pursue business and travel opportunities.
"They've got to be fully vaccinated but we certainly will be welcoming them with open arms," the premier said.
The relaxation on border rules comes despite SA still being short of its original target of having 80 per cent of those aged 16 and over double-dosed.
As of Monday, federal government figures put the vaccination rate at 77.4 per cent.
Some local virus measures also remain in place, including a requirement to wear masks in most venues such as shopping centres and on public transport.
SA reported no new virus cases on Monday and has two active infections, both in people who acquired the disease overseas.
