We just did this last week. Our original itinerary, booked with the glitch, had an overnight stay in Toronto. Ended up booking separate ticket, 9 pm to Newark.when I checked my bags in tlv, I asked if they can tag it straight to ewr, the agent told me I should have arrived at airport earlier and gone to a different desk (before security) and they would have done it for me, but now it's too late. (When I checked in in tlv, only the tlv-yyz boarding passes printed, whereas on the way to tlv, when we checked in in ewr, both sets of boarding passes automatically printed)But when we landed in yyz, anyone we spoke with did not understand why our bags weren't tagged straight through. No one cared that my original itinerary had flight scheduled for the next morning. Also, if you don't tag bags through when you check in in tlv, you may need to pay a baggage fee in yyz, as that separate ticket is not considered an international flight.