The airline Swiss cancelled six flights and suspended 52 pilots Tuesday after they warned that fears over job uncertainty could affect their performance in the air. The airline, which is being bought by Lufthansa, said the cancellations affected less than 100 passengers traveling to Munich and Brussels. It said on Monday night it would suspend immediately the 52 pilots and have experts test their aptitude after they signed an open letter to management in which they said uncertainty about their future could have "repercussions on safety." The European Commission, the EU's executive branch, approved on July 5 the German carrier's acquisition of Swiss.