Tell us about the worst behaviour you’ve witnessed on a flight

As Sean Duffy has urged passengers to mind their manners, we would like to hear about the worst breaches of airline etiquette that you’ve seen

The US transportation secretary Sean Duffy has started a “civility campaign” for air travel, urging passengers to dress smartly instead of wearing PJs and slippers, keeping children’s behaviour in check and remembering their manners.

With this in mind, we would like to hear about the untoward airline behaviour you’ve witnessed. What is the worst breach of aeroplane etiquette you’ve seen?