I was stopped at the ticket counter on my return home (to EY) with my 4 small children. This was the return flight of a round-trip ticket. They told me that they were not allowed to board non-Israeli citizen passengers who did not have a round-trip booked back to the US. I do not know where they got such ridiculous information, but I ended up having to book 5 round-trip fully refundable tickets while I was standing there at the desk. As soon as I got to my destination (Jerusalem), I promptly canceled those tickets.
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