HA...I read the title of this article and immediately clicked on it - as I attempted to get some Alcohol on an Airline yesterday until I realized they wanted 7 bucks for a Bud Light on the leg from Chicago to St Louis!!
Then I realized - wrong alcohol and wrong airline.
I was thinking the same thing after cruising in the Gulfstream II yesterday. Good thing the Pilots had the cooler already stocked.

As far as getting air line antifreeze in bulk you could probably check and see if they have any at a local Class 8 truck shop / truck stop or dealer .