Delta Airlines and American Airlines have announced that they will be banning hoverboards starting this weekend.

According to the airlines, passengers will not be able to bring these two-wheel scooters in flights (both in checked or carry-on luggage) because because of their oversized lithium batteries that are fire hazards.

Delta did not give a specific company or manufacturer, but said that they will not be allowing “balance gilders, hoverboards, and self-balancing boards of any type which use lithium or lithium-ion batteries.”

The airline said a statement that the “self-balancing personal transportation devices will be banned from their flights starting December 11. “Delta reviewed hoverboard product specifications and found that manufacturers do not consistently provide detail about the size or power of their lithium-ion batteries,” they said. “

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

American Airlines, meanwhile, announced that it will ban the device starting Sunday.

Patty Davis, spokeswoman of the U.S. Consumer Product Safety Commission, said that they are investigating reports of overboard fires. “We know consumers are giving it as a gift during the holidays,” she told reporters. “We are working all across the country to move our investigation into the fires forward as quickly as possible.”

Other smaller airlines that have also banned hoverboards from their flights include Hawaiian, Spirit, Virgin American, and Alaska.