When your average daredevil skydives for fun, the plane is typically travelling at between 130km/h and 180km/h when the skydiver jumps.Tandem and accelerated free fall (AFF) jumps occur between 10,000 feet (3000m) and 13,000 feet (4000m), while static jumps can be as low as 3500 feet (1000m).
A large aircraft can't fly that slowly.
Read more at https://www.gizmodo.com.au/2014/02/why-dont-commercial-airplanes-have-parachutes-for-passengers/#Cpi6xi5JzYC4Qfrb.99
RE: Letter to the Airlines:Is it too much to ask for a parachute