In June, I flew SOF-TLV on El Al, with a late night departure. The plane was late in getting into SOF (not an usual situation with El Al) and they rushed the passengers to board, saying that if we don't depart in time to arrive by a certain time (I think it was 1 a.m. but am not certain) we would not be able to take off for an additional 3 hours, as TLV would be jammed with large flights arriving from North America.