In 1930/40's in Germany, Horten Brothers, Walter + Reimar, built succession of flying wing designs. Quite advanced and cutting edge for time. "Ho" series is:
After service in the air battle over China, The P-40 "War Weary", of the 23rd Fighter Group, was assigned to a Chinese Fighter Pilot training unit. The plane was being flown to the school and as it was coming in for a landing at Kunming, China, for refueling, it was caught in a strong gust of wind and crash landed – May 1944.