Hewitt-Sperry Automatic Airplane for eight years, and yet Sperry became intrigued with the concept of applying radio control to them. He realized that for radio control to be effective, automatic stabilization would be essential, so he decided to adapt his naval gyro-stabilizers (which he had developed for destroyers). In 1913, the Navy provided a flying boat to test and evaluate the gyro-based autopilot. Sperry's son Lawrence served as an engineer during the test phase. In 1914, Lawrence Sperry was in Europe and observed the developing techniques of aerial warfare, including the use of aircraft. In 1916, the two Sperrys joined Peter Hewitt, an
US-Bangla Airlines Flight 211 US-Bangla Airlines Flight 211 US-Bangla Airlines Flight 211 was a scheduled international passenger flight by US-Bangla Airlines from Shahjalal International Airport in Dhaka, Bangladesh to Tribhuvan International Airport in Kathmandu, Nepal. On 12 March 2018, the aircraft serving the flight, a 78-seater Bombardier Dash 8 Q400, crashed on landing, and burst into flames. There were 67 passengers and 4 crew members on board; 52 people died, while 19 survived. This is the deadliest aviation disaster involving a Bangladeshi airline, as well as the deadliest accident involving the Bombardier Dash 8-Q400. The aircraft was a Bombardier Dash 8 Q400 registered S2-AGU.