United Airlines introduced the first ‘non-smoking section’ on its planes in 1971. Smoking on US domestic flights was first banned in 1988 (for flights up to two hours) with all domestic and international flights required to be smoke-free by 2000. Since passengers sometimes disobey the law you’ll still find ashtrays in lavatories.
Usually though passengers aren’t so brazen as to just sit at their seat and light up. But our hero on a Spirit Airlines flight decided to throw caution to the wind. And it was captured on video.