I have been pursuing this.
As much as possible, I take my fish on long exploration trips..
Some USA airline security personal, immediately say no, because of the liquid. So either you have to only take baby fish. Or, some know, that if a fish is living there, then there cant be explosive chemicals in the water.
Also remember that if you start to put him in rockets, try to be sure its the kind of rocket with a parachute you can get at a toy store, not the kind you buy on the side of the road around the start of summer - those will send your fish away for ever, and you will never be able to enjoy their life lust.
Also. Fyi. My giant off season, swimming pool, grown goldfish, would flippy flap, across dry patches, seemingly to explore greater territory - risking their life, trying to evolve legs, they cant in one lifetime, just to go to the great beyond. You can clearly see how animals rose from the oceans. Also: Fish do sometimes try to FLY and explore. Hence the tank covers.