US aviation authorities confirmed that six people are feared dead after two World War II-era airplanes collided and crashed during an airshow in Dallas.<br />''<br />''A number of videos of the mid-air collision were making rounds on Twitter. In the videos, the two aircraft appeared to collide in the air before they both rapidly descended, causing a large fire and plumes of black smoke.<br />''<br />''The Federal Aviation Administration said it will investigate the crash at the Wings Over Dallas Airshow on Saturday, which describes itself as the US's premiere WW2 air show.<br />''<br />''One of the plane was B-17 bomber which played a major role in winning the air war against Germany in WW2. The second plane, a P-63 Kingcobra, was a fighter aircraft used only by the Soviet Air Force. <br />