Starting on October 22, the Federal Aviation Administration eliminated the rule that required an off switch for the "No smoking" sign, even though smoking on U.S. flights officially ended decades ago.

‘No Smoking’ Signs on Planes Can Now Stay On Forever The Federal Aviation Administration did away with a rule that had required an off switch for the sign even though smoking on U.S. flights ...

"While 'No Smoking' signs may seem like an old and outdated practice, they are still a necessity for a few different reasons," Maddi Bourgerie, travel expert at RVshare, tells Thrillist.