[Former Proud Canadian]

You forgot: when you could arrive at the terminal 20 minutes before departure and easily make your plane without a strip search.

[Notthereyet]

My beloved recalls as a college student booking a First Class seat at the last minute because of a mix-up.

He practically ran the full length of the airport to get to the correct terminal.

Turns out, they held the plane for him. He was the only person on that flight in First Class.

He said it was a weird experience at that age, what with having a stewardess assigned to his section just paying attention to him. And he mentioned her as being absolutely beautiful.

[Blue Jays]

"...arrive at terminal 20 minutes before departure..."

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Muslim terrorists really ruined that nice bit about air travel, too. That really was a pleasant aspect back in the day.
My typical plan for domestic flights is to arrive ninety minutes (or even two hours) prior to minimize opportunity for bizarre issues.