Sign up for a coupon on this page and you’ll receive 20% off your next LOT Polish flight (it’s set up so they need to hit a certain number of signups before you get the full 20% — otherwise you’ll get 15% — but I don’t see how they don’t hit the 30,000 signups necessary to reach the 20% threshold). You’ll get a coupon emailed to you on October 31st.
LOT has often been the least expensive business class option to Europe, though I’m noticing now that they seemed to have raised prices for flights once they introduce their new 787 service from Chicago (mid-January) and New York (early February). Those flights will feature a Premium Economy section and a flat bed in Business Class. With the 20% off coupon you’ll be looking at sub $4000 fares to Europe in business class which, depending on the market, is generally a pretty good deal (except to Frankfurt, where business class fares during the spring are under $3,000, which is amazing).