According to their website, TW was contacting passengers to make alternative arrangements. Of course if the pax don't leave contact info, ther's not much that can be done. Always wise to confirm a flight the day before, had they done so they would have known that TW tickets were being honoured (SA) on LH,AF,BA,SK,CO and OA.
TW and AA are still operating separately and I doubt dropping TLV was prompted by AA. TW has pulled out of other routes eg. LIS on short notice before.