I think the response is a bit different because previously the attacks relied on the attacker not staying at the scene of the attack plus the attacker wanted to survive the attack.
With Islamic terrorism came more sophisticated attacks that required more logistical planning. These were only possible because the people carrying out the attacks were simultaneously committing suicide in the process.
Previous attacks did affect procedures it’s just that they weren’t as noticeable and the type of surveillance we have now was not possible at the time due to the technology being used. For instance bags were unloaded if the passenger didn’t board[0] or flight observation decks were enclosed to stop RPG’s being fired at airplanes[1].
With Islamic terrorism came more sophisticated attacks that required more logistical planning. These were only possible because the people carrying out the attacks were simultaneously committing suicide in the process.
Previous attacks did affect procedures it’s just that they weren’t as noticeable and the type of surveillance we have now was not possible at the time due to the technology being used. For instance bags were unloaded if the passenger didn’t board[0] or flight observation decks were enclosed to stop RPG’s being fired at airplanes[1].
[0] - https://en.wikipedia.org/wiki/Pan_Am_Flight_103?wprov=sfti1
[1] - https://en.m.wikipedia.org/wiki/1975_Orly_Airport_attacks