The failed attempt with the shoe. I thought that was clear from my post?

https://en.wikipedia.org/wiki/American_Airlines_Flight_63_(2001)

>In 2006, security procedures at American airports were changed in response to this incident, with passengers required to remove their shoes before proceeding through scanners.[The requirement was phased out for some travelers, particularly those with TSA PreCheck, in 2011.[8] Also in 2011, the rules were relaxed to allow children 12 and younger and adults 75 and older to keep their shoes on during security screenings.

And

https://en.wikipedia.org/wiki/2006_transatlantic_aircraft_plot

>The 2006 transatlantic aircraft plot was a terrorist plot to detonate liquid explosives, carried aboard airliners travelling from the United Kingdom to the United States and Canada, disguised as soft drinks.[1] The plot was discovered by British Metropolitan police during an extensive surveillance operation. As a result of the plot, unprecedented security measures were initially implemented at airports. The measures were gradually relaxed during the following weeks, but passengers are still not allowed to carry liquid containers larger than 100 ml onto commercial aircraft in their hand luggage in the UK and most other countries, as of 2022.