If you video and are asked to stop cabin crew can't seize your phone.
Since it is a civil matter police have no jurisdiction.
If you continue to film after being asked to stop and are then charged with not obeying crew, then the phone can be seized by police.
However, even after an arrest, you still may publish the video, but this is a grey area.
If the subject of the filming (other passengers) are unlikely to protest then it's you versus the airline, who would have claim you have unfairly affected their reputation by showing them let's say, drag a passenger out of their seat.
There are no circumstances where police in USA UK or Oz, can lawfully demand that you delete your video on the spot.
In general it is not the taking of videos that is a legal issue, it is publishing or distributing them where the law kicks in to protect the subject.
Going live to Periscope or Facebook with images of the public who are in a private place, is new legal territory.
Last edited by mickjoebill; 18th Apr 2017 at 15:21.