A spokesman said he expected EU countries will recognize the COVID passes issued to trial participants in other countries in the bloc.
"We are trying to move cautiously and progressively in the right direction so I wouldn't write anything off at this point."
EU flag lies at Schuman square on eve of Europe Day in Brussels.
A Jet2 Boeing 737-300 airplane takes off from the airport in Palma.
Rising numbers of COVID-19 infections in some parts of Europe could derail UK plans to re-open international travel routes from mid-May.
“Vaccine passports are not the answer this year. Apart from the fact they are still being talked about, they will take months to roll out...”
"Spain is pushing for the vaccine passport...."