[alistairSH]

It's been mixed for me.

San Salvador (SAL/MSLP) was probably the most obnoxious, with a double security configuration for US-bound flights. Basically had to pass through security in Lima, then again at SAL, and due to the config, it meant you couldn't get food in the main SAL terminal and wait at your gate - you had to eat it before entering the "US Zone" and then hope you weren't thirsty again. Also, everything electronic out of the bag, dump fluids, etc.

Heathrow wasn't great. Long lines for security. Also, they had some buggy facial recognition system that couldn't match me (at the gate) to a photo taken a few hours earlier in the security line. And the gate agent was completely clueless about what to do next. They eventually let me board anyways. Not sure what they were trying to accomplish - I had already passed through security, the final face check was at the gate during boarding.

Reykjavik was fine, no different than a US hub. Same for Rome and Lima.

Inverness and Edinburgh had typical checks, but the airports are so small and uncrowded that it's pretty stress-free. The only "problem" I've had a both is the ticket agents tend to show up moments before boarding begins (first flight of day), which gets my anxiety up some - I like to be at the gate relaxing well in advance.