At first, airlines allowed passengers with disabilities to bring their helper animals on board.
You know, blind or crippled people with their dogs.
Then, people claimed to need emotional support animals.
They claimed that they were trained, but emotionally-unbalanced people lie, you know.
So, they brought cats and chickens and lizards and snakes and ponies.
To the point where their desire for emotional comfort caused massive emotional unrest among the other passengers.
That’s when some clown claimed that they should be allowed to bring their emotional support elephant.
“Get a fucking life, asshole,” said the airlines. “And take the train.”