1955 EL AL FLIGHT SHOT DOWN OVER BULGARIA. A cover from France to Israel with a 50Fr cancelled Lyon Grolee 25-7-1955 that was shot down by the Bulgarian Air Force killing all on board after the plane accidently strayed into Bulgarian airspace. Recovered mail received a three line violet boxed cachet in Hebrew translated ‘This cover was recovered from an El Al airplane that was shot down over Bulgaria 27.7.1955. An August 10 1955 arrival datestamp is on the back.