Danger from missiles
Realistically, the danger is negligible. The rockets being fired at TLV are without warheads (removed to get the range), so they would have to directly hit a plane on approach or on the ground to do any damage. So far only one rocket fragment has made it as far as 1.6km from the airport (that is what triggered the FAA announcement, since rescinded).
However crews may still be uncomfortable. Nevertheless, all the major scheduled airlines except LH and TK are flying to BGN again now.