Ms. von der Leyen did not offer a timeline on when exactly tourist travel might open up or details on how it would occur. But her comments are a top-level statement that the current travel restrictions are set to change on the basis of vaccination certificates.(...) Based on Ms. von der Leyen’s comments, the European Commission will recommend the change in travel policy, though individual member states may reserve the right to keep stricter limits. They might not permit citizens from outside the bloc to visit or might enforce restrictions like quarantines, even on visitors who have vaccination certificates.But countries like Greece, Spain, Italy, Portugal and Croatia that welcome millions of American tourists each summer, and greatly depend on them for income and jobs, are set to jump at the opportunity to reopen to the American tourism market with the E.U.’s blessing.