I agree on the troubles you might have with trying to get any sort of liquid on an airplane these days, but...
helterskelter,
I was wondering if you could elaborate on the fact that ammo lock and air are a toxic combination. I am not asking because I disgaree with you since this is pretty much news to me, but rather because I would have some serious doubts that any fish that is kept in a bag for an extended period of time would die without the oxygen. My reasoning for thinking that is simply because when I was running Co2 on a previously planted tank, just a slightly miscalculated adjustment of the Co2 soleniod would lead to every single one of my fish coming to the surface for air in what I felt was an amazingly short period of time - hence, I figured the lack of O2 in the bag would result in the same thing. Granted, in my tank I could easily control the amount of gas exchange that was occuring, however, it seems as though the oxygen must have escaped and/or been depleted quickly.
I also wonder why ammo lock wouldn't cause the same sort of effect on an aquarium....especially those with a relatively tight fitting lid since that might be just like the bag scenario, only on a larger scale because it doesn't really remove the ammonia, but only helps 'transform' that ammonia into its less-toxic form of ammonium -- the keywords being 'less' and 'toxic' together. So, my advice would be more along the lines of, if you are going to and can take the fish with you, place it in the largest bag possible, with a lot of airspace at the top and skip adding the ammo lock and/or similar product. However, I could be completely wrong on that, I suppose.
I guess my point here is that I can easily see how there would be a 'race' between a lack of oxygen versus a fatal level of ammonia regarding which would result in the fish's death first --- and my money is on the lack of oxygen...especially if the fish was without significant levels of O2 for a large portion of being transported in the bag for so long that ammonia can accumulate that much. Certainly that much water cannot hold enough dissolved oxygen on its on own to last forever on a few hours long journey. In fact, I remember my brother telling me that when he decided to trade in some very large cichlids that he inherited from his room mate, the fish were already gasping at the top of the water before he drove the 3 or 4 miles from his house to my parents and he was transporting them in a big 10 gallon bucket with no lid on it at all. A few even died, including the one I wanted to trade him for.
While it is a less-than-educated guess, I would think that perhaps the ammo lock is simply uneffective and/or hazardous in the case of a fish being in a bag because