Aerial refueling craft was eventually modified by Airspeed to Cobham's specification, for a non-stop flight from London to India, using in-flight refueling to extend the plane's flight duration. Meanwhile, in 1929, a group of U.S. Army Air Corps fliers, led by then Major Carl Spaatz, set an endurance record of over 150 hours with the "Question Mark" over Los Angeles. Between June 11 and July 4, 1930, the brothers John, Kenneth, Albert, and Walter Hunter set a new record of 553 hours 40 minutes over Chicago using two Stinson SM-1 Detroiters as refueler and receiver. Aerial refueling remained a very dangerous process
The Heart of What Was Lost leader, Duke Isgrimnur, leads his army in pursuit, determined to destroy the Norns and their ancient Queen Utuk'ku once and for all. The book is told from three points of view: Duke Isgrimnur of Rimmersgard; a Norn leader, Viyeki; and Porto, a Perdruinese mercenary. Jason Heller, a book reviewer for NPR, reviewed the book, stating the novel balances "warmth with grimness, and gentle bits of humor with violence and vengeance. Williams has tapped back into the dynamic that made "Memory, Sorrow, and Thorn" so absorbing." Aiden Moher at Barnes & Noble's fantasy blog called "The Heart of What Was Lost"