I do, sometimes. But when I can always get them it's less of a "treat".

There are a few things I only get intentionally when traveling for work so it's something to look forward to and brings something positive to the trip.

Anticipating it nervously as the attendant distributes them down the aisle and then receiving it for free makes it taste better.

Like half the article is about why these cookies are popular in flight

Sure, there are a lot of things like this you can do. It would eat up a minute of your time and cost a premium to buy a tiny packet of an individually-wrapped biscoff. Or you could spend ~$36 to buy a box of 300 biscoffs that occupy a space in your cupboard, and then every time you fly, you take one out of the box and put it in your carry-on, and resist the temptation to eat it unless you are 10km high.

Tomato juice is also disproportionately popular during flights compared to what one would normally order grounded. You can also buy tomato v8 juice from a shop, but there’s a reason taste changes when you’re flying, which they explain in the article.

A lot of people in the replies here unable to conceive of buying some from a shop and then taking them on the flight themselves, therefore bypassing the need to prioritise Delta. Unbelievable.