DL: JFK-LHR $349ai, LAX-LHR $530ai Some pretty low T fares (100% mileage and MQMs) to normally expensive London, on Delta.com until April 12. This was first mentioned in the Delta forum, but after playing around with it, $349 is available JFK-AMS-LHR-JFK April 1-3. $530 LAX-DTW-LHR-ATL-LAX. Lots of options for weekend travel and possibly same day turns. I posted screen shots on my blog if anyone is interested. Remember, Delta has a 24+ hour cancellation policy, so book now and think about it later. Posted on FT by The Points Guy today.