"Hoverboards," or hands-free electric scooters, have exploded in popularity. But not everyone is a fan.

Authorities from Australia to the UK have deemed the transportation technology illegal on streets and sidewalks, putting a damper on the party.

Many airlines are following suit, banning hoverboards outright or relegating them to carry-on luggage only.

After being spotted beneath the feet of Missy Elliot and Jason Derulo, teens and teens at heart are taking to the streets — and apparently the skies — on the newest form of personal transport.

However, hoverboard policy differs from airline to airline, causing confusion for jetsetting hoverboard-ers:

Just watched a guy hover-board nonchalantly onto an airplane — Wesli Bloom (@helloimwesli) November 25, 2015

so ur telling me a dude can take one of those hover board things on the airplane but I can't take a bottle of lotion..... sounds fake but ok — a (@adnamaleigh) October 30, 2015

@NelsonDomingue2 No, hoverboards aren't allowed on our aircraft. — JetBlue Airways (@JetBlue) November 30, 2015

I like @jetblue's name for those things that are not hoverboards. "balance gliders" pic.twitter.com/G36smMkjZl — Anthony Quintano (@AnthonyQuintano) November 20, 2015

Hoverboards don't qualify as permitted electronic device under most airlines' existing policies. But they are one of many devices with lithium ion batteries that have the airlines and regulators concerned.

Currently, these are the regulations in place for hoverboards at different airlines:

United: Allowed in checked luggage, but battery must be removed and taken as carry-on

Delta: Not allowed in checked or carry-on luggage

American: Allowed as carry-on only

Southwest: Allowed in checked luggage if battery is under 160 Watt-hours

JetBlue: Not allowed in checked or carry-on luggage

Virgin America: Not allowed in checked luggage

Alaska: Not allowed in checked or carry-on luggage.

Frontier: Not allowed in checked or carry-on luggage.

As of February this year, there were 151 recorded air and airport incidents "involving batteries carried as cargo or baggage" since March 1991, according to the Federal Aviation Administration. Several of those incidents involved a fire caused by a battery in passenger luggage.

In the FAQ section of the Swagway website it states outright that the hoverboard is not allowed on flights as a carry-on: "Passengers are prohibited from carrying on lithium batteries containing more than 2 grams of lithium content and lithium ion batteries containing more than 25 grams of equivalent content. The Swagway contains 43 grams."

Most hoverboards contain 36 volt 4.4AH lithium ion batteries, with 158.4Wh.

Current FAA guidelines state that in a carry-on, "Passengers may carry all consumer-sized lithium ion batteries (up to 100 watt hours per battery). Passengers can also bring two larger lithium ion batteries (100-160 watt hours per battery) in their carry-on."

The same batteries allowed in carry-on luggage are allowed in checked, except for "spare (uninstalled) lithium metal and lithium-ion batteries," which are completely banned. "The batteries must be protected from damage and short circuit or installed in a device. Battery-powered devices — particularly those with moving parts or those that could heat up — must be protected from accidental activation."

In October, the FedAviation Administration banned e-cigarettes in checked baggage. And in July, Boeing warned airlines against flying bulk shipments of lithium-ion batteries.

UPDATED Dec. 10, 3:30 p.m. ET to reflect Delta's all-out ban on hoverboards.