Why? Because it's there?
Perhaps it's because I think that conquering the skies is mankind's greatest triumph over nature. I understand the physics but it still never ceases to amaze me that 300 tonnes of metal, composites, fuel and self-loading-freight can get into the air, let alone navigate itself across the globe and (for the most modern airliners) even land itself and make the tea.
I want to be a part of that. But since I'm only a humble PPL I pride myself in the knowledge that less than 1% of the population hold a pilot's licence. Hence I fly, at great expense(can't be many hobbies that are this costly) because I can. Because it's there. Because I'm far more likely to get flattened going from A to B via the A1M than going via EGNH, if you know what I mean.
Anyway, enough waffle, I still want to know what Aerbabe's bottle trick is all about....