Did not the security people learn anything from the coroner's report into the Lindt Chocolat siege?
From the time the passengers and cabin crew overpowered and secured the mentally ill man, took away his 'bomb,' and the aircraft landed, the situation altered in a subtle way. The passengers on the aircraft actually then became hostages. They were hostages locked in an aluminium tube, surrounded by 70 tonnes of jet fuel (apologies to a previous poster), not to mention being kept in proximity to what was thought could be a bomb, and fed no information, as far as can be ascertained, but could see the their aircraft surrounded by armed police.
This over a 90 minute period
I leave it to others to determine who then the hostage takers were.
The question should be not 'why did it take so long to 'storm' the aircraft.' but rather 'why did they not release the hostages immediately after landing via air stairs and opening one or more of the doors.'