The person who objects to sitting next to the woman should offer to move (presumably to a middle seat, or switch to a less crowded flight). He should have arranged his seat previously (and a frum travel agent would know to book an entire two in order to avoid a problem). El Al, unlike, for example, Southwest, lets you book an actual seat in advance. In the US as well, the hareidi would be considered an out of line passenger and would probably be offered refund, especially if there was someone waiting to take the seat.
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