Much of the wing is designed to be walkable, the areas that should not be walked on are marked by lines and have the "No Step" messages on them.

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I wonder where people think all the old photos of people sitting on wings, in engines etc. come from and I also wonder if there was such an outrage about it back then.

Sure, health and safety are a more prominent thing now and we learned a lot since then, but with such things becoming more corporate rule based and black and white, it just leaves less room for humanity and fun. I can see why people seem to be outraged, but It seems we've lost focus just a little bit. Given the chance I would probably go sit on a wing or in an engine for fun. Common sense should be applied of course and as far as I can see this was done in the above video (They stayed in the middle of the wing, didn't do hand stands etc.)

It's not exactly smart to do this in front of a people filled terminal, I agree, but I feel like people are overreacting just a bit. And as much as I would love to complain about the degeneration of society, I just don't see this an an example of it.