In move that will benefit millions of travellers annually, Romania and Bulgaria partially joined Europe’s ID-check-free travel zone on Sunday, marking a new step in the two countries’ integration with the European Union.

After years of negotiations to join the Schengen area, there is now free access for travellers arriving by air or sea from both countries. However, land border checks will remain in place due to opposition primarily from Austria which has long blocked their bid over illegal migration concerns.

The eased regulations are expected to positively impact the tourism sector and the lifting of border control is expected to facilitate operations at Bulgaria’s four international airports, which in 2023 saw nearly 11 million passengers, according to official data.

The airport in the capital, Sofia, serves as the biggest hub for Schengen flights which constitute 70% of all flights, airport representatives said.

EU Commission President Ursula von der Leyen hailed the change as a “huge success for both countries” and a “historic moment” for what is the world’s largest free travel zone.

The Schengen Area was established in 1985. Before Bulgaria and Romania’s admission, it was comprised of 23 of the 27 EU member countries, along with Switzerland, Norway, Iceland, and Liechtenstein. Around 3.5 million people cross an internal border each day.

Austria vetoed Romania and Bulgaria’s admission into the Schengen zone at the end of 2022 but allowed Croatia full accession. Bulgaria and Romania joined the EU in 2007 and Croatia in 2013.

Romanian Prime Minister Marcel Ciolacu called it a “well-deserved achievement” for Romania that he said will benefit citizens who can travel more easily and will bolster the economy.

“We have a clear and firmly assumed government plan for full accession to the Schengen Area by the end of the year,” he said.