31. Joint training with airborne troops and an emphasis on night formation flying began at the start of March. 32. This was compensated by the removal of gunnery and bombing training and a reduction in night and formation flying . 33. They also are the only display team in the world which actively has trained for formation flying at night. 34. "' Formation flying "'is the disciplined flight of two or more aircraft under the command of a flight leader. 35. The accident prompted Germany to ban aerobatic flights, and many air shows have refused to even allow safer formation flying . 36. However, several noted that the training of the aircraft pilots for night formation flying and navigation was far from satisfactory. 37. He completed his training in formation flying , aerobatics and gunnery practice over the next four months, graduating in December 1938. 38. Many pilots who flew both preferred the B-17 over the B-24 for its greater stability and ease in formation flying . 39. The team flies a display lasting 18 20 minutes that includes formation flying , opposition passes, solo routines, and synchronized maneuvers. 40. The quality of the training was dubious, many of the crews had not been given proper tuition for formation flying .