Is it safer to carry a fish on an airplane or fedex them for the next morning, following the guides found on this site? (They'd be in a box maybe for 15 hours, at most.)
I'd like to carry them on but am terrified of the TSA. Even if the airline allows pets, and even if I make sure my fish is in a 3 oz container, if they say, "You can't bring that on" that's pretty much the bottom line and I can't miss my flight. But I also can't abandon a living creature.
Is there a difference in risk? Is fedexing safe?