The 24 pilot was filmed before 9/11. After 9/11, the show had to be modified because reality has become uncomfortably close to it. That included delaying the premiere and removing a scene involving an exploding passenger aircraft.

The Washington Post reported on a trend of shows about counter-terrorism and spies, on August 4 2011: https://www.washingtonpost.com/archive/lifestyle/2001/08/04/...

That article mentions that some of those shows relied on government consultation, with the CIA and FBI, to help with realism, etc. “24” was not one of them. “24” co-creator Joel Surnow is on record saying there was no government involvement.

Quote from the WP for context:

> Coming this fall [2001]: A new primetime drama series takes a close-up look at an elite federal agency and the dedicated men and women who hunt deadly terrorists and treacherous criminals.

> The new show's on CBS. It's also on NBC. And ABC. And Fox. Some years it's twenty-something sitcoms. Sometimes it's doctors, or vermin-oriented "reality" shows. This fall, the trend is Fed TV: No fewer than five new network series depict the exploits of people with civil-service pay grades, shiny employee ID badges and very large guns.

But it was “24” that did the most to normalize the “torture the bad guys till they reveal the plot” and other such right-wing wet dreams.