<i>They haven&#x27;t even bothered to try.</i><p>Sure they have. All three of the big legacy US airlines have some form of extra-legroom economy: American has Main Cabin Extra, Delta has Comfort+ and United has Economy Plus.<p>The problem is those seats cost more, and people shop for airfares based solely on the price they see in a search engine.<p>Airlines have tried all sorts of tricks to get people to buy the nicer seat. They&#x27;ve tried showing it to you as an option at booking. They&#x27;ve tried offering it as an upsell afterward. They&#x27;ve tried offering it during check-in. They&#x27;ve tried branding it as a separate fare class labeled &quot;premium&quot; but still a reasonable-looking price.<p>It&#x27;s entirely due to passenger behavior at this point: people will grumble and complain and whine about the legroom and the lack of power and the extra fees for everything, but the next time they book a ticket they&#x27;ll still just sort by lowest fare and pick that.