DS has been flying since he was about 3 months, he flies to Dublin about 3 or 4 times a year so no problems there thank God.
I agree with Floss
Dosen't every parent have one thing that will snap any toddler out of a tantrum?
In this instance mine would have been a steely glare and the word enough barked in a manner that would have left him in no doubt.
I had to do it once to get AB's into him when DH was away and it was in danger of going everywhere. He was about this age.
He was so shocked he opened his mouth and took it like a lamb.
From that I discovered that the look and the word used in extreme moderation was very effective.