Travellers will know that US TSA security screening is notoriously tight. Passengers are normally only allowed to fly with 100ml of liquids. Those watching the video asked if she had to give the airline prior warning, or get special permission for Pluto to fly.
"No just went there, they tested his water then let us through," Haley said.
Other aquarium keepers said they had also flown with their fish.
"My betta flew back and forth to college with me," said one.
US security screening asks that fish be kept in a clear, spill-proof glass or plastic container, but permit live fish to transit as carry on.
Most airlines are also fine with this arrangement. However, Delta has been an exception to this rule.
"Some fish YouTubers confirmed that Delta allows fish on flights, but since it doesn't happen often, some flight crew may not be in the know," said Haley.
Other viewers of Pluto's journey were less pleased.
"They let a fish on a plane with that amount of water but took my toddler's milk?"
Others joked it might be a new "travel hack": to save pouring out your bottle of water before security screening, put a goldfish in it.
