Small helium-inflated balloons, however, are allowed aboard aircraft in the United States. Still, some airlines might ask for ...

Always secure helium-filled balloons with a strong weight to prevent them from drifting away. Deflate and dispose of balloons properly once they’re no longer in use—never release them outdoors.

Securely tie helium-filled metallic balloons to a weight that is heavy enough to prevent them from floating away. Do not remove the weight until the balloons are deflated. Puncture and deflate ...

Richard Lascelles, R-Litchfield. “Deflated balloons pose a serious threat to the life and well-being of wildlife and marine animals via ingestion or entanglement with attached ribbons.” ...