For KLM and Lufthansa over Thanksgiving, sample round-trips include $1,869 Boston-London, $1,789 New

For KLM and Lufthansa over Thanksgiving, sample round-trips include $1,869 Boston-London, $1,789 New York-London, and $2,090 travel and sports San Francisco-Frankfurt. These are all about half the least expensive restricted business class fares and less than a third of the full fare. Buy by October 27, depart November 20 through 25, and return November travel and sports 25 through 30. I didn't find any other lines that were matching this deal, but they might.
In other business class promotions, two Asian lines are offering minor business class discounts. Through December 31, for example, Air China will fly you San Francisco-Beijing round trip for $3,750, compared with a regular fare of $6,660. Through March 31, China Airlines ' round-trip travel and sports fare from Los Angeles to Taipei drops to $4,087 (from $5,307).
Ongoing promotions: OpenSkies continues its apparently travel and sports never-ending "sale" to Paris. The current rate is $971 plus tax each way from New York to Paris. Singapore Airlines continues the $2,319 round-trip rate for business class on its one daily New York-Frankfurt flight. And Delta continues its 50-day advance purchase business discounts to Europe.