Delta and American Airlines Banning Hoverboards

— -- Hoverboards maybe on your holiday wish list, but at least two airlines are now keeping them grounded.

Delta said it is banning the "self-balancing personal transportation devices" in carry-on and checked baggage.

They say the "poorly labeled," powerful lithium-ion batteries powering them -- often exceeding government limits for being aboard aircraft -- pose a safety risk.

"Delta reviewed hoverboard product specifications and found that manufacturers do not consistently provide detail about the size or power of their lithium-ion batteries," the company said in its statement.

“While occurrences are uncommon, these batteries can spontaneously overheat and pose a fire hazard risk,” says the airline.

The company did not specify models or manufacturers, but rather banned all "balance gilders, hoverboards, and self-balancing boards of any type which use lithium or lithium-ion batteries."