Can these be used on airlines?

If you're looking for a good pair of airplane headphones I would first suggest Bose noise canceling headphones, they work the best. If you're trying to stay within the skill candy brand i would go with the skull candy hesh headphones I can personally say they are the best headphones I have every owned they fit great are comfy for 10+ hours of listening and I've had them for 6+ months (normally it takes me about 3 weeks to get through a pair of Ink'd headphones). So although they will work for airplanes they are not the best option and like others have said they break very easily so be prepared.

they arent wireless or anything like that so yes they can be used on airlines, however they do not come with the left/right adapter for plugging into the airplanes audio system so you will have to ask for one on the plane, and they are also not noise cancelling.

Yes they can.