What was real story behind drama of the Mumbai to Delhi Indian aeroplane hijacking on 3rd October 2001 ?

When an Indian plane from Mumbai was on its way to Delhi, on 3 rd October, 2001, it was reported by govt agencies that it was hijacked by 2 persons as pengers. Within minutes terror plot & name of Pakistan as usual in India started as propaganda. it was a little after 9/11, so, every effort was made to take maximum milage out of it to impress & influence USA(chamchagiri) to attach that with 9/11. It was done in similar manner as same drama of hijacking of Ganga was done in 1971 to create an opportunity to attack Pakistan to make Bangladesh is well known. This time Indian agencies made a blunder. When all agencies & TV channels cried of hijacking, the pengers on board called their relatives on cell phones that they were safe & there was no hijacking at all. That exposed d drama & USA too understood & couldn't be persuaded to invade Pakistan. So, after a lot of thought, parliament attack drama in Dec, 2001 was orchestrated & soon heavy troops started moving. Isn't it100% correct ?