This stamp will be issued April 9th. From Israel Post:

“The history of EL AL is intertwined with that of the State of Israel, the company was officially founded in 1949, but in fact its first flight took off in September 1948, flying President Chaim Weizmann from Geneva to Israel. The Swiss would not allow military aircraft to land in their territory, thus the company quickly turned a DC-4 Skymaster into a civilian plane. This plane, which opened the era of EL AL’s civilian flights, was called “Rehovot”. The establishment of an Israeli airline was significant not only as a business endeavor but as a means of contact among the Jewish towns in Eretz Israel and their defense.: