New Delhi, Nov. 26 -- US Transportation Secretary Sean Duffy unveiled a new public-awareness drive urging Americans to behave more respectfully while flying - including dressing better, helping fellow passengers and refraining from putting their feet on seats.

Speaking at Newark Airport in New Jersey, Duffy said he has observed "a degradation in civility" among air travelers, prompting his decision to launch what he called a "civility campaign" during the heavy holiday travel season.

Duffy encouraged travelers to rethink their airport attire.

"Whether it's a pair of jeans and a decent shirt, I would encourage people to maybe dress a little bit better, which encourages us to maybe behave a little better," he said.

"Let's try not to wea...