Why are Indian players wearing black armbands during Day 1 of the first Test between England and India?

India and England players and support staff will wear black armbands on day one of the first Test of the Anderson-Tendulkar Trophy series at Headingley, Leeds, on Friday, in tribute to the victims of the Air India plane crash.
The Indian players had also worn black armbands and observed a minute’s silence ahead of the intra-squad practice match that began on June 13.
On June 12, an Air India passenger plane flying from Ahmedabad to London crashed moments after takeoff from the Ahmedabad airport.
Only one person survived. The total death toll rose to 265 after the aircraft crashed into a medical college complex.
According to the airline, the flight was carrying 230 passengers — including 69 Indians, 53 British nationals, seven Portuguese, and one Canadian — along with 12 crew members.