There are no Finnair flights to Tartu, Estonia. Travel is suspended for a month.
The decision announced on Monday is a consequence of alleged Russian GPS jamming attacks - the new "top secret weapon" with which Russia has been attacking the region.
The Finnish airline recalls that last week two of its planes returned to the capital Helsinki halfway through their journey because GPS interference prevented them from landing in Tartu.
The ministers of the three Baltic countries - Estonia, Latvia and Lithuania - had already drawn attention to the issue.
According to Lithuania's foreign minister, the situation near the borders with Russia is becoming "too dangerous to ignore".
"If someone turns off the lights when you're driving at night, it becomes dangerous," said Gabrielius Landsbergis, speaking to the Financial Times, the newspaper that points out that this GPS blockade could lead to an air disaster.
His Estonian counterpart, Margus Tsahkna, talks about a "hybrid attack" by Russia and a "threat to people and security. We won't tolerate that," he said.
Latvian Foreign Minister Baiba Braže added: "We take these incidents seriously".
Since August last year, almost 50,000 planes have reported GPS interference on flights over the Baltic, a phenomenon that has particularly intensified in the region around the Russian enclave of Kaliningrad. The suspicion is on Russia, reports The Sun.
Civilian aircraft operating in the Baltic, Black Sea and Eastern Mediterranean have faced systematic electronic attacks through so-called DNS spoofing, which compromises the accuracy of GPS systems and other navigation instruments.
This is "extremely dangerous", warns an industry source.
In March, an unprecedented 63-hour attack disrupted the global satellite navigation systems of 1600 civilian aircraft in Europe.
There is a theory that Russia is trying to protect Kaliningrad from Ukrainian drones, but experts believe that the interference campaign could be a prelude to a possible wider shutdown of the European continent, as detailed in the latest report by Portuguese cybersecurity firm VisionWare.