01/31/2012. The XP-54 on its first flight, pictured with the incorrect tail number 11211, indicating the s/n 41-1211. That s/n already had been allocated to a Vultee BT-13A Valiant trainer. By the time of the second flight the error had been corrected and the tail number showed the correct 2108994, indicating the s/n 42-108994. View also photo 9699.