Flight AI 187, a Boeing 777-300ER (VT-ALU) with on-time departures at 2:56 AM from Delhi was climbing towards its cruising altitude and lost nearly 900 feet in altitude and a stall warning, a ground proximity warning, and "don’t sink" were issued from the Ground Proximity Warning System (GPWS). The pilots regained control of the aircraft and after dropping off the crew and a small flight delay, reached Vienna.