https://www.secretflying.com/posts/east-coast-usa-tel-aviv-israel-533-roundtrip/Possible free date change and no difference in fare.
"FLEXIBLE REBOOKING OPTIONS
In order to meet our Passengers' expectations, as of March 6, 2020, LOT Polish Airlines offers a free of charge option to change the date of travel to all Passengers who purchased tickets for connections within the LOT Polish Airlines route network.
The offer applies to all individual tickets purchased before August 31, 2020, valid for travel from April 12 to December 31, 2020. You now have the opportunity to change your departure date for any date before March, 31 2021 completely free of charge (the return date counts), provided that the new flight is on the same route and in the same booking class. If you choose a flight date on which the originally purchased fare is not available, you will have to cover the price difference between the currently available and original fares along with any difference in conditions.
The Passenger may also suspend the purchased ticket and indicate a new travel date until August 31. Any fees for changing the booking are waived, and the free-of-charge change is also possible if the Passenger does not show up for the flight (no-show). However, only one free-of-charge change is possible."
